exc/k&r/04-funcs-and-prog-struct/04-grep/04-grep-input.c

#include <stdio.h>

#define W 80
#define REPEAT 4000000

int main()
{
    int i, j;
    for (i = 0; i < REPEAT; i++) {
        for (j = 0; j < W; j++)
            putchar('y');
        putchar('\n');
    }
    return 0;
}