Number swapping function call by value

#include <stdio.h> void swapnum( int var1, int var2 ) { int tempnum ; /*Copying var1 value into temporary variable */ tempnum = var1 ; /* Copying var2 value into var1*/ var1 = var2 ; /*Copying temporary variable value into var2 */ var2 = tempnum ; } int main( ) { int num1 = 35, num2 = 45 ; printf("Before swapping: %d, %d", num1, num2); /*calling swap function*/ swapnum(num1, num2); printf("\nAfter swapping: %d, %d", num1, num2); }