Write a C Program to swap numbers using third variable

Alogrithm:

    

        1. Start

        2. Define a=20,b=30,temp

        3. Display a,b before swap

        4. temp = b

        5. b = a

        6. a = temp

        7. Display a,b after swap

        8. Stop

Flowchart:

The a = b in the rectangle is actually a = temp{alertInfo}

Code:

        

        #include<stdio.h>

        int main(){

                int a=20,b=30,temp;

                printf(“a=%d and b= %d before swapping.”, a,b);

                temp = b;

                b = a;

                a = temp;

                printf(“a= %d and b=%d after swapping.”, a,b);

            }{codeBox}

Explanation:

        The value of a is 20 and b is 30 at first. A temporary variable temp is assigned. The value of temp is passed to temp and a is passed to b and again the value of temp is passed to a. In this way, the values get swapped.

Before:

a = 20;

b = 30;

temp = b;  //temp becomes 30

b = a; //b becomes 20

a = temp; //a becomes 30

After:

a = 30;

b = 20;