Question

How to convert int to string without library functions in C

Answer 1

#include <stdio.h> 

int _strlen(char *s) {  
    int i = 0;
     
    while (s[i++] != '\0');
         
    return i - 1; 
} 

void _reverse(char *s) { 
    int i = 0, end = _strlen(s) - 1, temp; 
    while (i < end) { 
        temp = s[i]; 
        s[i] = s[end]; 
        s[end] = temp; 
        i++; end--; 
    } 
}  

void _inttostr(int n, char s[]) { 
    int i = 0; 
    while (n) { 
        s[i++] = (n % 10) + '0'; 
        n = n / 10; 
    } 
	
	_reverse(s); 
    s[i] = '\0'; 
}

int main(int argc, char **argv)
{ 
	char s[10] = ""; 
	int n = 9784;
	
	_inttostr(n, s);
	printf("%s\n", s); 
     
    return 0; 
}   
 
 
/*
run:
 
9784
 
*/

 

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