Matrix Multiplication Program in C programming

#include<stdio.h>

int main()

{

int a[100];

printf("[ First Matrix(2*2) ]\n\n");

printf("Enter 1st row 1st value = ");

scanf("%d", &a[0]);

printf("Enter 1st row 2nd value = ");

scanf("%d", &a[1]);

printf("Enter 2nd row 1st value = ");

scanf("%d", &a[2]);

printf("Enter 2nd row 2nd value = ");

scanf("%d", &a[3]);

printf("\n\n[ Second Matrix (2*2) ]\n\n");

printf("Enter 1st row 1st value = ");

scanf("%d", &a[4]);

printf("Enter 1st row 2nd value = ");

scanf("%d", &a[5]);

printf("Enter 2nd row 1st value = ");

scanf("%d", &a[6]);

printf("Enter 2nd row 2nd value = ");

scanf("%d", &a[7]);

printf("\n");

int e, b, c, d;

e=(a[0]*a[4])+(a[1]*a[6]);

b=(a[0]*a[5])+(a[1]*a[7]);

c=(a[2]*a[4])+(a[3]*a[6]);

d=(a[2]*a[5])+(a[3]*a[7]);

printf("|%d %d| |%d %d|\n",a[0],a[1],a[2],a[3]);

printf("|%d %d| |%d %d|\n",a[4],a[5],a[6],a[7]);

printf("\n\nAnswer\n\n");

printf("|%d %d |\n", e, b);

printf("|%d %d |\n", c, d);

    return 0;

}