CODEWITHSUNDEEP
cfor-loopif-statementcommand-line
bildungsroman11
bildungsroman11

Reputation: 71

C command line arguments for printing square

This code is supposed to print out a square like this without the blank line between them. I am trying to use the command line argument to determine the size of the square. It seems to just no read in the command line argument and just counts from 1 until I hit CTRL-C to stop it.

012345

123456

234567

345678

#include <stdio.h>                                                               
#include <stdlib.h>                                                              
                                                                             
                                                                             
int main(int argc, char *argv[])                                                 
{                                                                                
 int row;                                                                       
 int colm;                                                                      
                                                                             
 // Check for a command line argument.                                          
 if(argc < 2){                                                                  
  printf("usage: box size");                                                   
 }                                                                              
 else{                                                                          
                                                                             
  int n = atoi(argv[1]);                                                       
                                                                             
  for (row = 0; row <= n; row++){                                              
  n = row;                                                                   
  for (colm = 0; colm <= n; colm++){                                         
    printf("%d ",n);                                                         
    n++;                                                                     
  }                                                                          
  printf("\n");                                                              
 }                                                                            
}                                                                              
return 0;                                                                      
}

Upvotes: 0

Views: 254

Answers (1)

MikeCAT
MikeCAT

Reputation: 75062

Doing n++; in the loop for (colm = 0; colm <= n; colm++){ makes the upperbound escape from being reached and the loop will continue until overflow happens.

What you should do is printing the sum of row and colm without changing n.

for (row = 0; row <= n; row++){
  for (colm = 0; colm <= n; colm++){
    printf("%d ",row + colm);
  }
  printf("\n");
}

Upvotes: 1

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