Matrix in C arraya-CodePudding

I have to fill a 6x5 array with numbers: 52, 62, 72 etc till array is full. But I don't have an idea how to do it. Thank you for the help.

I tried this:

int main() {
    int a[6][5]; 
    int start = 52;
     
    for (int i = 0; i < 6; i  )
        for (int j = 0; j < 5; j  ) {
            a[i][j] = start;
            start  ;
        }

    for (int i = 0; i < 6; i  ) {
        for (int j = 0; j < 5; j  )
            printf("%d ", a[i][j]);
  
        printf("\n");
    }
   
    return 0;
}

CodePudding user response：

Your code would appear to work just fine. It produces:

52 53 54 55 56
57 58 59 60 61
62 63 64 65 66
67 68 69 70 71
72 73 74 75 76
77 78 79 80 81

If you expect to see:

52 62 72 ...

You just need to increment by 10 when initializing your matrix, instead of incrementing by 1 using the operator.

CodePudding user response：

You can do everything inside two nested for loops:

#include <stdio.h>

int main() {
    int a[6][5]; 
    int start = 52;
 
    for (int i = 0; i < 6; i  ) {
        for (int j = 0; j < 5; j  ) {
            a[i][j] = start;
            start  = 10;
            printf("%d ", a[i][j]);
        }
        printf("\n");
    }  
    return 0;
}

Note: start = 10 equals to start = start 10

This will result:

52 62 72 82 92 
102 112 122 132 142 
152 162 172 182 192 
202 212 222 232 242 
252 262 272 282 292 
302 312 322 332 342

CodePudding user response：

If you wish to increment by 10 horizontally and by 1 vertically, you can modify your code this way:

#include <stdio.h>

int main() {
    int a[6][5]; 
    int start = 52, col_incr = 10, row_incr = 1;
     
    for (int i = 0; i < 6; i  ) {
        for (int j = 0; j < 5; j  ) {
            a[i][j] = start   i * row_incr   j * col_incr;
        }
    }
    for (int i = 0; i < 6; i  ) {
        for (int j = 0; j < 5; j  ) {
            printf("%d ", a[i][j]);
        }
        printf("\n");
    }
   
    return 0;
}

Output:

52 62 72 82 92 
53 63 73 83 93 
54 64 74 84 94 
55 65 75 85 95 
56 66 76 86 96 
57 67 77 87 97