# C Exercises: Multiply two integers without using multiplication, division, bitwise operators, and loops

## C Programming Mathematics: Exercise-20 with Solution

Write a C program to multiply two integers without using multiplication, division, bitwise operators, and loops.

Example 1:

Input: n1 = 50

Input: n2 = 12

Output: 600

Example 2:

Input: n1 = 0

Input: n2 = 12

Output: 0

**Sample Solution:**

**C Code:**

```
#include <stdio.h>
// Recursive function to multiply two integers 'a' and 'b'
int multiply_two_nums(int a, int b) {
/* 0 multiplied with anything gives 0 */
if (b == 0)
return 0; // Return 0 if 'b' is zero
if (b > 0)
return (a + multiply_two_nums(a, b - 1)); // Recursive call when 'b' is positive, using addition
if (b < 0)
return -multiply_two_nums(a, -b); // Recursive call when 'b' is negative, using recursion and negation
return -1; // Return -1 for invalid inputs
}
// Main function to test the multiply_two_nums function with different values
int main(void) {
int n1 = 50;
int n2 = 12;
printf("\n %d x %d = %d", n1, n2, multiply_two_nums(n1, n2)); // Print the result of multiplication
n1 = 0;
n2 = 12;
printf("\n %d x %d = %d", n1, n2, multiply_two_nums(n1, n2)); // Print the result of multiplication
return 0;
}
```

Sample Output:

50 x 12 = 600 0 x 12 = 0

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