# How to set a specific column of a matrix to zero if a particular element in that column is zero with C

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edited 6 days ago

```#include <stdio.h>

#define COLS 6

void print_matrix(int matrix[][COLS], int rows, int cols) {
int i, j;

for (i = 0; i < rows; i++) {
for (j = 0; j < cols; j++) {
printf("%5i", matrix[i][j]);
}

printf("\n");
}
}

int matrix_column_include_number(int matrix[][COLS], int rows, int col, int number) {
for (int i = 0; i < rows; i++) {
if (matrix[i][col] == number) {
return 1;
}
}

return 0;
}

void set_matrix_column_to_zero(int matrix[][COLS], int rows, int col) {
for (int i = 0; i < rows; i++) {
matrix[i][col] = 0;
}
}

int main() {
int matrix[][COLS] = {
{  4,  7,  9, 18, 29, 0 },
{  1,  9, 18, 99,  4, 3 },
{  9, 17, 89,  0,  7, 5 },
{ 19, 49,  0,  1,  9, 8 },
{ 29,  4,  7,  9, 18, 6 } };

int col = 2;
int rows = sizeof(matrix) / sizeof(matrix[0]);

if (matrix_column_include_number(matrix, rows, col, 0)) {
set_matrix_column_to_zero(matrix, rows, col);
}

print_matrix(matrix, rows, COLS);

return 0;
}

/*
run:

4    7    0   18   29    0
1    9    0   99    4    3
9   17    0    0    7    5
19   49    0    1    9    8
29    4    0    9   18    6

*/```

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