# 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>
int multiply_two_nums(int a, int b) {
/* 0 multiplied with anything gives 0 */
if (b == 0)
return 0;
if (b > 0)
return (a + multiply_two_nums(a, b - 1));
if (b < 0)
return -multiply_two_nums(a, -b);
return -1;
}
int main(void)
{
int n1 = 50;
int n2 = 12;
printf("\n %d x %d = %d",n1, n2, multiply_two_nums(n1, n2));
n1 = 0;
n2 = 12;
printf("\n %d x %d = %d",n1, n2, multiply_two_nums(n1, n2));
return 0;
}
```

Sample Output:

50 x 12 = 600 0 x 12 = 0

**Flowchart: **

**C Programming Code Editor:**

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