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  1. #include <stdio.h>
  2.  
  3. int dodoubleloop(size_t rows, size_t cols, int m[rows][cols],
  4.                  int target, size_t *row, size_t *col) {
  5.     for (size_t i = 0; i < rows; i++) {
  6.         for (size_t j = 0; j < cols; j++) {
  7.             if (m[i][j] == target) {
  8.                 *row = i;
  9.                 *col = j;
  10.                 return 1;
  11.             }
  12.         }
  13.     }
  14.     return 0;
  15. }
  16.  
  17. int main(void) {
  18.     size_t n = 12, m = 42;
  19.     int matrix[n][m];  // C99 VLA
  20.     int value = 2023;
  21.  
  22.     matrix[7][39] = 2023; // it's UB accessing other elements!!
  23.     size_t row, col;
  24.     for (int kk = -1; kk < 2; kk++) {
  25.         int status = dodoubleloop(n, m, matrix, value + kk, &row, &col);
  26.         if (status) {
  27.             printf("value %d found in cell (%zu, %zu)\n", value + kk, row, col);
  28.         } else {
  29.             printf("value %d not found\n", value + kk);
  30.         }
  31.     }
  32.     return 0;
  33. }
  34.  
Success #stdin #stdout 0.01s 5404KB
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stdin
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Standard input is empty
stdout
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value 2022 not found
value 2023 found in cell (7, 39)
value 2024 not found
https://ideone.com/TOX6Uh
exit double loop
language:
C (gcc 8.3)
created:
2 years ago
visibility:
secret

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