51 lines
750 B
C
51 lines
750 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <ctype.h>
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#include <limits.h>
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char next_sign_char();
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inline char next_sign_char() {
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char c;
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while (isspace(c = getchar()));
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return c;
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}
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int read_int(int* p) {
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int i = 0;
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bool pos = true;
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char c = next_sign_char();
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if (c == '-' || c == '+') {
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pos = c == '+';
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} else if (!isdigit(c)) {
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return 0;
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} else {
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i = c - '0';
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}
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while ((c = getchar()) != EOF && c != '\n' && c != ' ') {
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if (!isdigit(c)) return 0;
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int digit = c - '0';
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if ((pos && i > (MAX_INT - digit) / 10) ||
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(!pos && i > (-1 * MIN_INT - digit) / 10)) {
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break;
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}
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i *= 10;
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i += c - '0';
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}
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*p = pos ? i : -i;
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return 1;
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}
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int main() {
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int a;
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read_int(&a);
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printf("%d", a);
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}
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