CODEWITHSUNDEEP
carraysloops
Sanee Reimoo
Sanee Reimoo

Reputation: 19

How to generate tables using arrays?

#include <stdio.h>
#include <stdlib.h>

int main()
{
    system("color f0");
    int k,i,j,n;

    printf("Generate tables upto:");
    scanf("%d",&n);
    int tables[n][10];
    printf("Table\t");
    for(k=1;k<=10;k++)
    {
        printf("%dx\t",k);
    }
    printf("\n");
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=10;j++)
        {
            tables[i][j]=i*j;
            printf("%d\t",tables[i][j]);
        }
    }
    return 0;
}

This is my code which i am working on but unfortunately I am not able to generate it the way I want. The required output should look like this.

Upvotes: 0

Views: 111

Answers (2)

P.P
P.P

Reputation: 121357

Array indexing starts from 0 and goes up to n-1. So you are accessing out of bounds which is undefined behaviour.

So you need to rewrite the loops as:

for(i=0; i < n; i++) {
   for(j=0; j < 10; j++) {
      tables[i][j] = (i+1)*(j+1);
      printf("%d\t", tables[i][j]);
   }
}

Upvotes: 1

Jean-Fran&#231;ois Fabre
Jean-Fran&#231;ois Fabre

Reputation: 140168

proposal fix for your code

  • C-arrays start at 0
  • you're missing tabs and linefeed at the proper locations

code:

#include <stdio.h>
#include <stdlib.h>

int main()
{
    system("color f0");
    int k,i,j,n;

    printf("Generate tables upto:");
    scanf("%d",&n);
    int tables[n][10];
    printf("Table\t");
    for(k=1;k<=10;k++)
    {
        printf("%dx\t",k);
    }
    printf("\n");
    for(i=2;i<=n;i++)
    {
        printf("%d\t",i);
        for(j=1;j<=10;j++)
        {
            tables[i-1][j-1]=i*j;
            printf("%d\t",tables[i-1][j-1]);
        }
       printf("\n");
    }
    return 0;
}

display with n=4

Generate tables upto:4
Table   1x      2x      3x      4x      5x      6x      7x      8x      9x      10x
2       2       4       6       8       10      12      14      16      18      20
3       3       6       9       12      15      18      21      24      27      30
4       4       8       12      16      20      24      28      32      36      40

Upvotes: 1

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