C Programs with Solutions

In this post, basic C Programs with Solutions are described along with the description of code used in the program. It also explains the common terms used to write a program in the C language. Some common terms are:

• #include:It is a preprocessor directive that tells the preprocessor to include header files in the program.
• Angular brackets(<>): At the start & end of the header file, angular brackets are used.
• Header Files: Header files are used to provide the inbuilt functions used in the program. there are many headers files which are used in c & C++ Programs. Some header files used in the following program are as follows:
  • stdio.h: It Stands for Standard Input Output. This header file is used to provide inbuilt function “printf” & “scanf” to the program
  • math.h– math.h header file is used to perform a mathematical function in the program. For example sqrt() – to find the square root, pow() – to find the power of the number.
• int main () : “main()” specify that the body of the program started from here and int specifies that the program will return an integer value.
• return 0: return o specifies that the function is returning the integer value. This Code is used because int is used at the starting of the body.

Some of the basic C programs with solutions are explained one by one which are as follows:

Hello World Program in C

Code of The Above Question:

#include <stdio.h>
int main() {
   printf("Hello World");
   return 0;
}

Output:

Hello World

Description of Above Code:

• In the beginning,#include <stdio.h> is to provide inbuilt functions “printf” & “scanf” in the program.
• In the next line,int main()is used to start the body of the program & specifies that the program must return an integer value.
• The ; is used to end the line.
• The body of the program starts and end with curly brackets {}.
• In the body,
  • Statement printf("Hello World") is used to display the output on the console i.e. Hello World
  • In the last line return 0 is used to specify that the program is returning integer value.

C Program For Addition of Two Numbers

Code of The Above Question:

#include <stdio.h>
int main() {    
    int num1, num2, sum;
    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);
    sum = num1 + num2;      
    printf("Addition of Two Numbers is %d", sum);
    return 0;
}

Output:

Enter two integers:23
37
Addition of Two Numbers is 60

Description of Above Code:

• In the beginning,#include <stdio.h> is to provide inbuilt functions “printf” & “scanf” in the program.
• In the next line,int main()is used to start the body of the program & specifies that the program must return an integer value.
• The ; is used to end the line.
• The body of the program starts and end with curly brackets {}.
• In the body,
  • It is used to enter the type of variables used int num1, num2, sum
  • Statement printf("Enter two integers: ") is used to display the output Enter two integers: on the console.
  • scanf("%d %d", &num1, &num2) This is used to take input of the variables from the user.
  • sum = num1 + num2 This is used to find the division.
  • This statement is used to display the division calculated on the console printf("Addition of Two Numbers is %d", sum)
  • In the last line return 0 is used to specify that the program is returning integer value.

Multiplication of Two Numbers in C

Code of The Above Question:

#include <stdio.h>
int main() {    
    int num1, num2, mul;
    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);
    mul = num1 * num2;      
    printf("Multiplication of Two Numbers is %d", mul);
    return 0;
}

Output:

Enter two integers: 20
40
Multiplication of Two Numbers is 800

Description of Above Code:

• In the beginning,#include <stdio.h> is to provide inbuilt functions “printf” & “scanf” in the program.
• In the next line,int main()is used to start the body of the program & specifies that the program must return an integer value.
• The ; is used to end the line.
• The body of the program starts and end with curly brackets {}.
• In the body,
• It is used to enter the type of variables used int num1, num2, mul
• Statement printf("Enter two integers: ") is used to display the output Enter two integers: on the console.
• scanf("%d %d", &num1, &num2) This is used to take input of the variables from the user.
• mul = num1 * num2 This is used to find the division.
• This statement is used to display the division calculated on the console printf("Multiplication of Two Numbers is %d", mul)
• In the last line return 0 is used to specify that the program is returning integer value.

Subtraction of Two Numbers in C

Code of The Above Question:

#include <stdio.h>
int main() {    
    int num1, num2, sub;
    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);
    sub = num1 - num2;      
    printf("Subtraction of Two Numbers is %d", sub);
    return 0;
}

Output:

Enter two integers:30
15
Subtraction of Two Numbers is 15

Description of Above Code:

• In the beginning,#include <stdio.h> is to provide inbuilt functions “printf” & “scanf” in the program.
• In the next line,int main()is used to start the body of the program & specifies that the program must return an integer value.
• The ; is used to end the line.
• The body of the program starts and end with curly brackets {}.
• In the body,
  • It is used to enter the type of variables used int num1,num2,sub
  • Statement printf("Enter two integers: ") is used to display the output Enter two integers: on the console.
  • scanf("%d %d", &num1, &num2) This is used to take input of the variables from the user.
  • sub = num1 - num2 This is used to find the division.
  • This statement is used to display the division calculated on the console printf("Subtraction of Two Numbers is %d", sub)
  • In the last line return 0 is used to specify that the program is returning integer value.

C Program For division of Two Numbers

Code of The Above Question:

#include <stdio.h>
int main() {    
    int num1, num2, div;
    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);
    div = num1 / num2;      
    printf("Division of Two Numbers is %d", div);
    return 0;
}

Output:

Enter two integers:4
2
Division of Two Numbers is 2

Description of Above Code:

• In the beginning,#include <stdio.h> is to provide inbuilt functions “printf” & “scanf” in the program.
• In the next line,int main()is used to start the body of the program & specifies that the program must return an integer value.
• The ; is used to end the line.
• The body of the program starts and end with curly brackets {}.
• In the body,
  • It is used to enter the type of variables used int num1,num2,div
  • Statement printf("Enter two integers: ") is used to display the output Enter two integers: on the console.
  • scanf("%d %d", &num1, &num2) This is used to take input of the variables from the user.
  • div = num1 / num2 This is used to find the division.
  • This statement is used to display the division calculated on the console printf("Division of Two Numbers is %d", div)
  • In the last line return 0 is used to specify that the program is returning integer value.

C Program To Find The Modulus of Two Numbers

Code of The Above Question:

#include <stdio.h>
int main() {    
    int num1, num2, mod;
    printf("Enter two integers: ");
    scanf("%d %d", &num1, &num2);
    mod = num1 % num2;      
    printf("Modulus of Two Numbers is %d", mod);
    return 0;
}

Output:

Enter two integers:53
5
Modulus of Two Numbers is 3

Description of Above Code:

• In the beginning,#include <stdio.h> is to provide inbuilt functions “printf” & “scanf” in the program.
• In the next line,int main()is used to start the body of the program & specifies that the program must return an integer value.
• The ; is used to end the line.
• The body of the program starts and end with curly brackets {}.
• In the body,
  • It is used to enter the type of variables used int num1,num2,mod
  • Statement printf("Enter two integers: ") is used to display the output Enter two integers: on the console.
  • scanf("%d %d", &num1, &num2) This is used to take input of the variables from the user.
  • mod = num1 % num2 This is used to find the division.
  • This statement is used to display the division calculated on the console printf("Modulus of Two Numbers is %d", mod)
  • In the last line return 0 is used to specify that the program is returning integer value.

C Program To Find The Average of Five Numbers

Code of The Above Question:

#include <stdio.h>
int main()
{
float a,b,c,d,e,avg;
printf("enter the five numbers to find average");
scanf("%f %f %f %f %f",&a,&b,&c,&d,&e);
avg=(a+b+c+d+e)/5;
printf("Average of five number is %f",avg);
return 0;
}

Output:

enter the five numbers to find average 1
2
3
4
5
Average of five number is 3.00000

Description of Above Code:

• In the beginning,#include <stdio.h> is to provide inbuilt functions “printf” & “scanf” in the program.
• In the next line,int main()is used to start the body of the program & specifies that the program must return an integer value.
• The ; is used to end the line.
• The body of the program starts and end with curly brackets {}.
• In the body,
  • It is used to enter the type of variables used float a,b,c,d,e,avg
  • Statement printf("enter the five numbers to find average")is used to display the output enter the five numbers to find average on the console.
  • scanf("%f %f %f %f %f",&a,&b,&c,&d,&e) This is used to take input of the variables from the user.
  • avg=(a+b+c+d+e)/5 This is used to find the average of five numbers entered by the user.
  • This statement is used to display the average of five numbers calculated on the console printf("Average of five number is %f",avg)
  • In the last line return 0 is used to specify that the program is returning integer value.

C Program For Simple Interest

Code of The Above Question:

#include<stdio.h>
int main()
{
float p,r,t,si,amount;
printf("enter the values principle,rate,interest");
scanf("%f %f %f",&p,&r,&t);
si=(p*r*t)/100;
printf("simple interest is %f",si);
return 0;
}

Output:

enter the values principle,rate,interest 10
10
10
simple interest is 10

Description of Above Code:

• In the beginning,#include <stdio.h> is to provide inbuilt functions “printf” & “scanf” in the program.
• In the next line,int main()is used to start the body of the program & specifies that the program must return an integer value.
• The ; is used to end the line.
• The body of the program starts and end with curly brackets {}.
• In the body,
  • It is used to enter the type of variables used float p,r,t,si,amount
  • Statement printf("enter the values principle,rate,interest") is used to display the output enter the values principle, rate, interest on the console.
  • scanf("%f %f %f",&p,&r,&t) This is used to take input of the variables from the user.
  • si=(p*r*t)/100 This is used to find the simple interest.
  • This statement is used to display the simple interest calculated on the console printf("simple interest is %f",si)
  • In the last line return 0 is used to specify that the program is returning integer value.

C Program to Find The Compound Interest

Code of The Above Question:

#include <stdio.h>
#include <math.h>
int main() {    
  float p,r,t,ci;
  printf("enter the principal, rate and time for compound interest");
  scanf("%f %f %f",&p,&r,&t);
  ci=p*pow((1+(r/100)),t);
  printf("compound interest is %f",ci);
    return 0;
}

Output:

enter the principal, rate and time for compound interest 5
100
2
compound interest is 20

Description of Above Code:

• In the beginning,#include <stdio.h> is used to provide inbuilt functions “printf” & “scanf” in the program
• And, #include <math.h> is used to provide inbuilt function “pow” in the program
• In the next line,int main()is used to start the body of the program & specifies that the program must return an integer value.
• The ; is used to end the line.
• The body of the program starts and end with curly brackets {}.
• In the body,
  • It is used to enter the type of variables used float p,r,t,ci
  • Statement printf("enter the principal, rate and time for compound interest") is used to display the output enter the principal, rate and time for compound interest on the console.
  • scanf("%f %f %f",&p,&r,&t)This is used to take input of the variables from the user.
  • ci=p*pow((1+(r/100)),t) This is used to find the compound interest.
  • This statement is used to display the compound interest calculated on the console printf("compound interest is %f",ci)
  • In the last line return 0 is used to specify that the program is returning integer value.