Advance calculator This is my first C project — an Advanced Calculator that performs mathematical operations like basic arithmetic to include matrix operations, digit-based calculations, and more

#include <stdio.h> #include <stdlib.h>

void addition(); void subtraction(); void multiplication(); void division(); void modulus(); void matrixAddition(); void matrixMultiplication(); void sumOfDigits(); void productOfDigits(); void percentageCalculator(); void displayMenu();

int main() { printf("welcome boss! i am your calculator,ready to solve your problems"); int choice;

while (1) {
    displayMenu();
    printf("Enter your choice: ");
    scanf("%d", &choice);
    
    switch (choice) {
        case 1: addition(); break;
        case 2: subtraction(); break;
        case 3: multiplication(); break;
        case 4: division(); break;
        case 5: modulus(); break;
        case 6: matrixAddition(); break;
        case 7: matrixMultiplication(); break;
        case 8: sumOfDigits(); break;
        case 9: productOfDigits(); break;
        case 10: percentageCalculator(); break;
        case 0: 
            printf("Exiting program...\n");
            exit(0);
        default: 
            printf("Invalid choice! Please try again.\n");
    }
    
    printf("\nPress any key to return to menu...\n");
    getchar();
    getchar();
}

return 0;

}

// Function to display menu void displayMenu() { printf("\n----> ADVANCED CALCULATOR <----\n"); printf("1. Addition\n"); printf("2. Subtraction\n"); printf("3. Multiplication\n"); printf("4. Division\n"); printf("5. Modulus\n"); printf("6. Matrix Addition\n"); printf("7. Matrix Multiplication\n"); printf("8. Sum of Digits\n"); printf("9. Product of Digits\n"); printf("10. Percentage Calculator\n"); printf("0. Exit\n"); } void addition() { double a, b; printf("Enter two numbers: "); scanf("%lf %lf", &a, &b); printf("Result: %.2lf\n", a + b); } void subtraction() { double a, b; printf("Enter two numbers: "); scanf("%lf %lf", &a, &b); printf("Result: %.2lf\n", a - b); } void multiplication() { double a, b; printf("Enter two numbers: "); scanf("%lf %lf", &a, &b); printf("Result: %.2lf\n", a * b); } void division() { double a, b; printf("Enter two numbers: "); scanf("%lf %lf", &a, &b); if (b == 0) printf("Error! Division by zero is not allowed.\n"); else printf("Result: %.2lf\n", a / b); } void modulus() { int a, b; printf("Enter two integers: "); scanf("%d %d", &a, &b); if (b == 0) printf("Error! Modulus by zero is not allowed.\n"); else printf("Result: %d\n", a % b); }

void matrixAddition() { int r, c, i, j; printf("Enter number of rows and columns: "); scanf("%d %d", &r, &c); int A[r][c], B[r][c], sum[r][c];

printf("Enter elements of first matrix:\n");
for (i = 0; i < r; i++)
    for (j = 0; j < c; j++)
        scanf("%d", &A[i][j]);

printf("Enter elements of second matrix:\n");
for (i = 0; i < r; i++)
    for (j = 0; j < c; j++)
        scanf("%d", &B[i][j]);

printf("Resultant Matrix:\n");
for (i = 0; i < r; i++) {
    for (j = 0; j < c; j++) {
        sum[i][j] = A[i][j] + B[i][j];
        printf("%d ", sum[i][j]);
    }
    printf("\n");
}

}

void matrixMultiplication() { int r1, c1, r2, c2, i, j, k; printf("Enter rows and columns for first matrix: "); scanf("%d %d", &r1, &c1); printf("Enter rows and columns for second matrix: "); scanf("%d %d", &r2, &c2);

if (c1 != r2) {
    printf("Matrix multiplication not possible!\n");
    return;
}

int A[r1][c1], B[r2][c2], result[r1][c2];

printf("Enter elements of first matrix:\n");
for (i = 0; i < r1; i++)
    for (j = 0; j < c1; j++)
        scanf("%d", &A[i][j]);

printf("Enter elements of second matrix:\n");
for (i = 0; i < r2; i++)
    for (j = 0; j < c2; j++)
        scanf("%d", &B[i][j]);
for (i = 0; i < r1; i++)
    for (j = 0; j < c2; j++)
        result[i][j] = 0;
for (i = 0; i < r1; i++)
    for (j = 0; j < c2; j++)
        for (k = 0; k < c1; k++)
            result[i][j] += A[i][k] * B[k][j];

printf("Resultant Matrix:\n");
for (i = 0; i < r1; i++) {
    for (j = 0; j < c2; j++)
        printf("%d ", result[i][j]);
    printf("\n");
}

} void sumOfDigits() { int num, sum = 0; printf("Enter a number: "); scanf("%d", &num);

while (num > 0) {
    sum += num % 10;
    num /= 10;
}

printf("Sum of digits: %d\n", sum);

} void productOfDigits() { int num, product = 1; printf("Enter a number: "); scanf("%d", &num);

while (num > 0) {
    product *= num % 10;
    num /= 10;
}

printf("Product of digits: %d\n", product);

} void percentageCalculator() { double marksObtained, totalMarks; printf("Enter marks obtained: "); scanf("%lf", &marksObtained); printf("Enter total marks: "); scanf("%lf", &totalMarks);

if (totalMarks == 0)
    printf("Error! Total marks cannot be zero.\n");
else
    printf("Percentage: %.2lf%%\n", (marksObtained / totalMarks) * 100);

}