#include <stdio.h>
int main() {
int x;
if (90<=x)
printf("%dは90点以上なのでSです。\n",x
); else if (80<=x)
printf("%dは80点以上なのでaです。\n",x
); else if (60<=x)
printf("%dは60点以上なのでbです。\n",x
); else
printf("%dは60点未満なのでdです。\n",x
); return 0;
}
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