58 lines
1.0 KiB
C
58 lines
1.0 KiB
C
#include <stdio.h>
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#include <string.h>
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int myatoi(char *s, int l, int base);
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int main(int argc, char **argv)
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{
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printf("Print your string number\n");
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char s[100]; scanf("%s", s);
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printf("Enter your string number base\n");
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int base;
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scanf("%d", &base);
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printf("Your converted number is %d\n", myatoi(s, strlen(s), base));
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return 0;
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}
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int myatoi(char *s, int l, int base)
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{
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int result = 0;
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int is_pos = 1;
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int symb;
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int d;
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for(int i=0; i < l; i++)
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{
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symb = (int)s[i];
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if((int)s[i]=='-')
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{
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is_pos = -1;
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}
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else if(base <= 10)
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{
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if((int)s[i] < '0' || (int)s[i] > '9')
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{
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printf("Not a number\n");
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result = 0;
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break;
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}
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result = result * base + ((int)s[i] - '0');
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}
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else
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{
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if (symb >= '0' && symb <= '9')
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{
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d = symb - '0';
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}
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else if (symb >= 'A' && symb <= 'Z')
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{
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d = symb - 'A' + 10;
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}
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else if (symb >= 'a' && symb <= 'z')
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{
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d = symb - 'a' + 10;
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}
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result = result * base + d;
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}
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}
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result = result * is_pos;
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return result;
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}
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