>>478
#include <stdio.h>
#include <stdlib.h>
int main(void){
FILE * fp;
int i = 1;
if (!(fp = fopen("log.txt", "r"))) {
printf("%d回目です\n", i);
} else {
fscanf(fp, "%d", &i);
fclose(fp);
printf("%d回目です\n", i);
}
if (!(fp = fopen("log.txt", "w"))) {
fprintf(stderr, "file error\n");
return 1;
}
fprintf(fp, "%d", i + 1);
fclose(fp);
return 0;
}