how can we check to not enter the any string or char?

int n_mines;
printf("How many mines do you want in the minefield?");
scanf("%d", &n_mines);

while(n_mines>100 || n_mines<0)
{
printf("Please only enter between 1 and 100");
scanf("%d", &n_mines);
}

so I dont want to user can enter the string or char value,how can I
check it?

.

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