C program to calculate and print sum of two number

Problem In Hand

C Program to take input for two numbers calculate and print their sum

Sum of two numbers program in C is discussed below in various methods

Without using function
Using functions with out passing arguments
Using function by passing arguments

Process and Solution Of Problem

Take input for two numbers and store them in two variables
calculate and store sum of the number in a third variable
further display the result

Solution : Without using function
Program/Source Code

#include <stdio.h>
 int main()
 {
     int a,b,c;
     printf("Enter 1st no ");
     scanf("%d",&a);
     printf("Enter 2nd no ");
     scanf("%d",&b);
     c=a+b;
     printf("Sum = %d",c);
     return 0;
 }

Program Explanation

On execution of the program

* user enteres the first number and it is stored in a variable “a”
* user enteres the second number and it is stored in a variable “b”
* further calculation is performed and sum of values stored in “a” and “b” are stored in a variable “c” i.e. c=a+b;
* then the result is displayed on the screen

Output:

Enter 1st no 10
Enter 2nd no 20
Sum = 30

Solution : Using function Without Passing Arguments
Program/Source Code

#include <stdio.h>
void sum()
{
    int a,b,c;
    printf("Enter 1st no ");
    scanf("%d",&a);
    printf("Enter 2nd no ");
    scanf("%d",&b);
    c=a+b;
    printf("Sum = %d\n",c);
}

int main()
{
    sum();
    return 0;
}

Output:

Enter 1st no 10
Enter 2nd no 20
Sum = 30

Solution : Using function Passing Arguments
Program/Source Code

#include <stdio.h>
void sum(int a,int b)
{
    int c;
    c=a+b;
    printf("Sum = %d\n",c);
}

int main()
{
    int a,b;
    printf("Enter 1st no ");
    scanf("%d",&a);
    printf("Enter 2nd no ");
    scanf("%d",&b);
    sum(a,b);
    return 0;
}

Output:

Enter 1st no 100
Enter 2nd no 200
Sum = 300

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