问如何使用带有字符条件的if语句将int值插入矩阵？

EN

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

int main() {

    int mat[2][2] = { NULL };
    char sex;

    printf("Insert gender (m or f):");
    scanf_s("%c", &sex);
    if (&sex == "m") {
        mat[0][0] = 1;
        }
    if (&sex == "f") {
        mat[0][0] = 2;
    }
    else{
        mat[0][0] = 3;
        printf("invalid\n");
    }
    printf("inserted: %c \n", sex);

    printf("value on matrix 00: %i\t", mat[0][0]);
    //printf("%i\n", mat[0][1]);
    //printf("%i\t", mat[1][0]);
    //printf("%i", mat[1][1]);

    return 0;
}