C Exercises: Swap elements using call by reference
C Pointer : Exercise-11 with Solution
Write a program in C to swap elements using call by reference.
Pictorial Presentation:
Sample Solution:
C Code:
#include <stdio.h>
void swapNumbers(int *x,int *y,int *z);
int main()
{
int e1,e2,e3;
printf("\n\n Pointer : Swap elements using call by reference :\n");
printf("------------------------------------------------------\n");
printf(" Input the value of 1st element : ");
scanf("%d",&e1);
printf(" Input the value of 2nd element : ");
scanf("%d",&e2);
printf(" Input the value of 3rd element : ");
scanf("%d",&e3);
printf("\n The value before swapping are :\n");
printf(" element 1 = %d\n element 2 = %d\n element 3 = %d\n",e1,e2,e3);
swapNumbers(&e1,&e2,&e3);
printf("\n The value after swapping are :\n");
printf(" element 1 = %d\n element 2 = %d\n element 3 = %d\n\n",e1,e2,e3);
return 0;
}
void swapNumbers(int *x,int *y,int *z)
{
int tmp;
tmp=*y;
*y=*x;
*x=*z;
*z=tmp;
}
Sample Output:
Pointer : Swap elements using call by reference : ------------------------------------------------------ Input the value of 1st element : 5 Input the value of 2nd element : 6 Input the value of 3rd element : 7 The value before swapping are : element 1 = 5 element 2 = 6 element 3 = 7 The value after swapping are : element 1 = 7 element 2 = 5 element 3 = 6
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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