Multiply Two Numbers Without Using * Operator in C

✅ C Program to Multiply Two Numbers Without Using * Operator

#include <stdio.h>
int main() {
    int a, b, result = 0;
    printf("Enter two numbers (a * b):\n");
    scanf("%d %d", &a, &b);

    int x = a, y = b;
    while (y > 0) {
        if (y & 1) {        // if last bit of y is 1
            result += x;    // add current value of x
        }
        x <<= 1;            // multiply x by 2
        y >>= 1;            // divide y by 2
    }

    printf("Product is: %d\n", result);
    return 0;
}
  

📘 Explanation:

This program performs multiplication without using the multiplication (*) operator. It applies the Russian Peasant Multiplication Algorithm:

• if (y & 1) → If last bit of multiplier is 1, add current value of multiplicand.
• x <<= 1 → Left shift doubles the multiplicand.
• y >>= 1 → Right shift halves the multiplier.
• Loop continues until multiplier becomes 0.

🧾 Sample Output:

Enter two numbers (a * b):
6 7
Product is: 42
  

🔑 Keywords:

C program multiplication without *, bitwise multiplication in C, multiply without arithmetic operator, coding interview bitwise questions

📌 Hashtags:

#CProgramming #BitwiseOperators #Multiplication #InterviewPrep #LearnC

🔍 Search Description:

Learn how to multiply two numbers in C without using the multiplication operator (*). Uses bitwise shift and addition. Explained with code and output.

✅ Multiply Two Numbers Without Using * Operator in C

#include <stdio.h>
int main() {
    int a, b, mul = 0;
    printf("Enter any two numbers:\n");
    scanf("%d %d", &a, &b);

    int positive = 1;

    // Handle negative values
    if (b < 0) {
        b = -b;
        positive = -1;
    }

    for (int i = 1; i <= b; i++) {
        mul = mul + a;
    }

    mul = positive * mul;  // Adjust sign

    printf("Multiplication of given numbers is: %d\n", mul);
    return 0;
}
  

📘 Explanation:

This program multiplies two numbers without using the * operator. It performs multiplication using repeated addition logic. Here's how it works:

• If the second number is negative, we make it positive and remember the sign.
• We add a to the result b times using a loop.
• Finally, we apply the sign to get the correct result.

🖥️ Sample Output:

Enter any two numbers:
5 -4
Multiplication of given numbers is: -20
  

🔑 Keywords:

multiply without star, no multiplication operator, C multiplication with addition, how to multiply in C, multiplication tricks in C, logic building programs

📌 Hashtags:

#CProgramming #MultiplyWithoutOperator #BitwiseLogic #NoMultiplication #BeginnerC #OperatorTricks #LogicalCPrograms

🔍 Search Description:

This C program multiplies two integers without using the multiplication operator (*). It uses a loop with repeated addition, includes sign adjustment for negative numbers, and is useful for learning low-level logic implementation.