Swapping of two number without using third variable

 #include <stdio.h>

int main() { int num1, num2; printf("Enter the first number: "); scanf("%d", &num1); printf("Enter the second number: "); scanf("%d", &num2); printf("Before swapping:\n"); printf("First number: %d\n", num1); printf("Second number: %d\n", num2); // Swapping without a temporary variable num1 = num1 + num2; num2 = num1 - num2; num1 = num1 - num2; printf("After swapping without a third variable:\n"); printf("First number: %d\n", num1); printf("Second number: %d\n", num2); return 0; }