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Created August 9, 2024 14:50
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the c programming language book, exercise 5-6
Raw
itoa.c
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
/*
code is from the book, i only added minimal witdth -- w
*/
void itoa(int n, char s[], int w);
void reverse(char s[]);
int main(void) {
char buffer[20];
printf("INT_MIN: %d\n", INT_MIN);
itoa(INT_MIN, buffer, 10);
printf("Buffer : %s\n", buffer);
return 0;
}
void itoa(int n, char s[], int w) {
int i, sign;
sign = n;
i = 0;
do {
s[i++] = abs(n % 10) + '0';
} while ( n /= 10 );
if (sign < 0)
s[i++] = '-';
while(i < w) {
s[i++] = ' ';
}
s[i] = '\0';
reverse(s);
}
void reverse(char s[]) {
int c, i, j;
for ( i = 0, j = strlen(s)-1; i < j; i++, j--) {
c = s[i];
s[i] = s[j];
s[j] = c;
}
}
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