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#include <stdlib.h> int main(void) { char str[32]; printf("Please, input number: "); fflush(stdout); scanf("%s", str); int i; for(i = 0; str[i] != '\0'; i++) { if(str[i] <= '0' || str[i] >= '9') { printf("Error occured in index %d: %s\n", i, str); exit(EXIT_FAILURE); } } printf("Number: %s\n", str); return 0; }
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