Operation(+-) in matrix

 #include <stdio.h>

#include <conio.h>

int main() {

  int r, c, a[100][100], b[100][100], sum[100][100], i, j,d,e;

  printf("Enter the number of rows: ");

  scanf("%d", &r);

  printf("Enter the number of columns: ");

  scanf("%d", &c);


  printf("\nEnter elements of 1st matrix:\n");

  for (i = 0; i < r; ++i)

    for (j = 0; j < c; ++j) {

      scanf("%d", &a[i][j]);

    }


  printf("Enter elements of 2nd matrix:\n");

  for (i = 0; i < r; ++i)

    for (j = 0; j < c; ++j) {

      scanf("%d", &b[i][j]);

    }



  printf("\n\nYour 1st matrix is:\n");

  for (i = 0; i < r; i++)

  {

    for (j = 0; j < c; j++) {

      printf("%d   ", a[i][j]);

    }

    printf("\n");

}



  printf("\n\nYour 2nd matrix is:\n");

  for (i = 0; i < r; i++)

  {

    for (j = 0; j < c; j++) {

      printf("%d   ", b[i][j]);

    }

    printf("\n");

}


printf("\n\nEnter 1 for addition \nEnter 2 for subtraction \n\nEnter your response: ");


scanf("%d",&d);

if(d==1){

  for (i = 0; i < r; ++i)

    for (j = 0; j < c; ++j) {

      sum[i][j] = a[i][j] + b[i][j];

    }



  printf("\nSum of two matrices: \n");

  for (i = 0; i < r; i++)

  {

    for (j = 0; j < c; j++) {

      printf("%d   ", sum[i][j]);

    }

    printf("\n");

}

}

else if(d==2)

{

printf("\n\nEnter 1 for (1st matrix - 2nd matrix) \nEnter 2 for (2nd matrix - 1st matrix)\n\nEnter your response: ");

scanf("%d", &e);

  if(e==1){

  for (i = 0; i < r; ++i)

    for (j = 0; j < c; ++j) {

      sum[i][j] = a[i][j] - b[i][j];

    }



  printf("\nYour result matrix is: \n");

  for (i = 0; i < r; i++)

  {

    for (j = 0; j < c; j++) {

      printf("%d   ", sum[i][j]);

    }

    printf("\n");


}

}

else if(e==2)

{

  for (i = 0; i < r; ++i)

    for (j = 0; j < c; ++j) {

      sum[i][j] = a[i][j] - b[i][j];

    }



  printf("\nYour result matrix is: \n");

  for (i = 0; i < r; i++)

  {

    for (j = 0; j < c; j++) {

      printf("%d   ", sum[i][j]);

    }

    printf("\n");


}

}

}

  return 0;

}

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