Preview:
#include<stdio.h>
#include<conio.h>

void main(){
    int a[3][3],b[3][3];
    int i,j;
    printf("\n Plz., enter values of two matrix to add them...");
    printf("\n Enter values of first matrix: ");

    for ( i = 0; i < 3; i++)
    {
        for ( j = 0; j < 3; j++)
        {
            scanf("%d",&a[i][j]);
        }
    }

            for ( i = 0; i < 3; i++)
    {
        printf("|");
        for ( j = 0; j < 3; j++)
        {
            printf("\t %d",a[i][j]);
        }
        printf("\t |");
        printf("\n");
    }

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

    for ( i = 0; i < 3; i++)
    {
        for ( j = 0; j < 3; j++)
        {
            scanf("%d",&b[i][j]);
        }
    }

        for ( i = 0; i < 3; i++)
    {
        printf("|");
        for ( j = 0; j < 3; j++)
        {
            printf("\t %d",a[i][j]);
        }
        printf("\t |");
        printf("\n");
    }

    printf("\n");
    printf("The summation of two matrix: ");

    for ( i = 0; i < 3; i++)
    {
        printf("|");
        for ( j = 0; j < 3; j++)
        {
            printf("\t %d",(a[i][j]+b[i][j]));
        }
        printf("\t |");
        printf("\n");
    }
}
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