C

how to do matrix multiplication in c

#include<stdio.h>
void main(){
    int row1,column1,row2,column2,i,j,k,a[100][100],b[100][100],mul[100][100];
    //a[][] for first matrix and b for second matrix b[][]

    printf("Enter number of rows of first matrix : ");
    scanf("%d",&row1);
    printf("Enter number of columns of first matrix : ");
    scanf("%d",&column1);
    
    printf("#### Frist Matrix ####
");
    for(i=0;i<row1;i++){
        for(j=0;j<column1;j++){
            printf("Enter element a %d%d : ",i+1,j+1);
            scanf("%d",&a[i][j]);
        }
    }

    printf("Enter number of rows of second matrix : ");
    scanf("%d",&row2);
    printf("Enter number of columns of second matrix : ");
    scanf("%d",&column2);
    
    printf("#### Second Matrix ####
");
    for(i=0;i<row2;i++){
        for(j=0;j<column2;j++){
            printf("Enter element a %d%d : ",i+1,j+1);
            scanf("%d",&b[i][j]);
        }
    }
    if(column1 == row2){
        for(i=0;i<row1;i++){
            for(j=0;j<column2;j++){
                mul[i][j] = 0;
            }
        }
        
        for(i=0;i<row1;i++){
            for(j=0;j<column2;j++){
                for(k=0;k<row2;k++){  //as row2 = column1
                    mul[i][j] = mul[i][j] + a[i][k] * b[k][j];
                }
            }
        }
        
        for(i=0;i<row1;i++){
            for(j=0;j<column2;j++){
                printf("%d ",mul[i][j]);
            }
            printf("
");
        }
        
    }
}

how to do matrix multiplication in c

double[][] c = new double[N][N];
for (int i = 0; i < N; i++)
{
 for (int j = 0; j < N; j++)
 	{
 for (int k = 0; k < N; k++)
 		{
		 c[i][j] += a[i][k] * b[k][j];
 		}
 	}
}

matrix multiplication in c

#include <stdio.h>

int main()
{   int a_rows,a_cols,b_rows,b_cols,i,j,k,sum=0;

    printf("Enter the rows and columns for first matrix (row)(col)  :
");
    scanf("%d %d",&a_rows,&a_cols);

    printf("Enter the rows and columns for second matrix (row)(col) :
");
    scanf("%d %d",&b_rows,&b_cols);
    int a[a_rows][a_cols], b[b_rows][b_cols],matrix[10][10];

    if(a_cols != b_rows){
        printf("Sorry! We can't multiply the matrix because the column number of matrix 1 and the row number of matrix 2 aren't same !!
");
        
    }else{
        printf("Enter elements for first matrix  :
");
       for(i = 0; i < a_rows; i++){
           for(j = 0; j< a_cols; j++){
               scanf("%d",&a[i][j]);
           }
       }

    printf("Enter elements for second matrix  :
");

       for(i = 0; i < b_rows; i++){
           for(j = 0; j < b_cols; j++){
               scanf("%d",&b[i][j]);
           }
       }

       printf("multiplying matrix....
");
       //multiplying matrix
       for(i=0; i < a_rows; i++){
           for(j = 0; j < b_cols; j++){
               for(k = 0; k < a_cols; k++){
                   sum+=a[i][k] * b[k][j];
               }
               matrix[i][j] = sum;
               sum=0;
               
           }
           printf("
");
       }

       printf("first matrix  :
");
       for(i = 0; i < a_rows; i++){
           for(j = 0; j< a_cols; j++){
               printf("%d ",a[i][j]);
           }
           printf("
");
       }


        printf("

");

       printf("second matrix  :
");
       for(i = 0; i < b_rows; i++){
           for(j = 0; j< b_cols; j++){
               printf("%d ",b[i][j]);
           }
           printf("
");
       }


       printf("Multiplied matrix  :
");
       for(i = 0; i < a_rows; i++){
           for(j = 0; j< b_cols; j++){
               printf("%d ",matrix[i][j]);
           }
           printf("
");
       }
    }

     

    return 0;
}

multiplication of matrix in c

enter the number of row=3
enter the number of column=3
enter the first matrix element=
1 1 1
8 8 8
3 3 3
enter the second matrix element=
1 1 1
2 2 2
3 3 3
multiply of the matrix=
6 6 6
12 12 12
18 18 18

matrix multiplication in c

Matrix Multification