ABC294B嵌套循环字符ASCII转换

#include <stdio.h>
int n, m, i, j, k;
int main(){
    scanf("%d%d", &n, &m);
    for(i=1; i<=n; i++){
        for(j=1; j<=m; j++){
            scanf("%d", &k);
            if(k) printf("%c", (char)(k+64));
            else printf(".");
        }//大写A是64
        printf("\n");
    }
    return 0;
}