Practical 9 PPS

Write a program for multiplication of two matrices.

#include <stdio.h>

int main() {

    int rows1, cols1, rows2, cols2, i, j, k;

    printf("Enter the number of rows and columns of the first matrix:\n");

    scanf("%d %d", &rows1, &cols1);

    printf("Enter the number of rows and columns of the second matrix:\n");

    scanf("%d %d", &rows2, &cols2);

    if (cols1 != rows2) {

        printf("Matrices cannot be multiplied!\n");

        return 0;

    }

    int matrix1[rows1][cols1], matrix2[rows2][cols2], product[rows1][cols2];

    printf("Enter the elements of the first matrix:\n");

    for (i = 0; i < rows1; i++) {

        for (j = 0; j < cols1; j++) {

            scanf("%d", &matrix1[i][j]);

        }

    }

    printf("Enter the elements of the second matrix:\n");

    for (i = 0; i < rows2; i++) {

        for (j = 0; j < cols2; j++) {

            scanf("%d", &matrix2[i][j]);

        }

    }

    // Multiplying matrices

    for (i = 0; i < rows1; i++) {

        for (j = 0; j < cols2; j++) {

            product[i][j] = 0;

            for (k = 0; k < cols1; k++) {

                product[i][j] += matrix1[i][k] * matrix2[k][j];

            }

        }

    }

    printf("The product of the matrices is:\n");

    for (i = 0; i < rows1; i++) {

        for (j = 0; j < cols2; j++) {

            printf("%d ", product[i][j]);

        }

        printf("\n");

    }

    return 0;

}

Write a program to find length of string without using library function.

#include <stdio.h>

int main()

{

char s[100];

int i;

printf(“Enter a string: “);

scanf(“%s”, s);

for(i = 0; s[i] != ‘\0’; ++i);

printf(“Length of string: %d”, i);

return 0;

}

Write a program to concatenate two strings without using library function  

#include <stdio.h>

#include <string.h>

void concat(char[], char[]);

int main()

{

    char s1[50], s2[30];

    printf("\nEnter String 1 :");

    gets(s1);

    printf("\nEnter String 2 :");

    gets(s2);

    concat(s1, s2);

    printf("\nConcated string is :%s", s1);

    return (0);

}

void concat(char s1[], char s2[])

{

    int i, j;

    i = strlen(s1);

    for (j = 0; s2[j] != '\0'; i++, j++)

    {

        s1[i] = s2[j];

    }

    s1[i] = '\0';

}