C Exercises: Swap two numbers using the function
C Function : Exercise-3 with Solution
Write a program in C to swap two numbers using the function.
C programming: swapping two variables
Swapping two variables refers to mutually exchanging the values of the variables. Generally, this is done with the data in memory.
The simplest method to swap two variables is to use a third temporary variable :
define swap(a, b) temp := a a := b b := temp
Pictorial Presentation:
Sample Solution:
C Code:
#include<stdio.h>
void swap(int *,int *);
int main()
{
int n1,n2;
printf("\n\n Function : swap two numbers using function :\n");
printf("------------------------------------------------\n");
printf("Input 1st number : ");
scanf("%d",&n1);
printf("Input 2nd number : ");
scanf("%d",&n2);
printf("Before swapping: n1 = %d, n2 = %d ",n1,n2);
//pass the address of both variables to the function.
swap(&n1,&n2);
printf("\nAfter swapping: n1 = %d, n2 = %d \n\n",n1,n2);
return 0;
}
void swap(int *p,int *q)
{
//p=&n1 so p store the address of n1, so *p store the value of n1
//q=&n2 so q store the address of n2, so *q store the value of n2
int tmp;
tmp = *p; // tmp store the value of n1
*p=*q; // *p store the value of *q that is value of n2
*q=tmp; // *q store the value of tmp that is the value of n1
}
Sample Output:
Function : swap two numbers using function : ------------------------------------------------ Input 1st number : 2 Input 2nd number : 4 Before swapping: n1 = 2, n2 = 4 After swapping: n1 = 4, n2 = 2
Flowchart:
C Programming Code Editor:
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C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
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