89 lines
1.6 KiB
C
89 lines
1.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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int isbn13(char * isbn) {
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int sum = 0;
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int n = 13;
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for (int i = 0; i < n - 1; i++) {
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if ( (i + 1) % 2 == 0 ) {
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sum += 3 * (isbn[i] - '0');
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} else {
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sum += isbn[i] - '0';
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}
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}
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if ( 10 - ( sum % 10) == isbn[n - 1] - '0' ) {
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return 1;
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}
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return 0;
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}
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char * conv_isbn13(char * isbn) {
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char * new = malloc(13);
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int n = 10;
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new[0] = '9';
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new[1] = '7';
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new[2] = '8';
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for (int i = 0; i < n; i++) {
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new[i+3] = isbn[i];
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}
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return new;
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new[13] = '\0';
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}
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int isbn10(char * isbn) {
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int sum = 0;
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for (int i = 0; i < 9; i++) {
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sum += (i + 1) * (isbn[i] - '0');
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}
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if ( ( sum % 11) == isbn[9] - '0' ) {
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return 1;
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}
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return 0;
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}
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char * conv_isbn10(char * isbn) {
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char * new = malloc(10);
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for (int i = 0; i < 9; i++) {
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new[i] = isbn[i+3];
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}
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new[10] = '\0';
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return new;
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}
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void guess2(int l, int h);
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void guessnum() {
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printf("Think of a number between 0 and 100\n");
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guess2(0, 100);
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}
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void guess2(int l, int h) {
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int n = 0;
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int fitty = (l + h) / 2 ;
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int guess;
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int guesst;
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printf("IS your number %d?\n", fitty);
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scanf("%d", &guesst);
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if (guesst == 1) {
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printf("Your number is %d\n", fitty);
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exit(0);
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}
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while ( fitty != n ) {
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printf("IS you number greather than %d\n", fitty);
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scanf("%d", &guess);
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if (guess == 1) {
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guess2(fitty, h);
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} else {
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guess2(l, fitty);
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}
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}
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}
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int main(int argc, char const *argv[]) {
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guessnum();
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// printf("%s\n", conv_isbn10("9781435704572"));
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// printf("%s\n", conv_isbn13("0521396549"));
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return 0;
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}
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