Question

How to convert double to string in C

Answer 1

#include <stdio.h>
 
int main(void)
{
    double d = 23445.938076;
    char str[16] = "";
     
    sprintf(str, "%.6lf", d);
 
    printf("%s", str);
     
    return 0;
}
  
   
   
   
/*
run:
   
23445.938076
 
*/

 

Cleaner teeth, healthier you!
Get The Secret to a Bright and Healthy Smile

Answer 2

#include <stdio.h>

void double_to_string(char buf[], int size, double d) {
    for (int i = 0; i < size; i++) {
        double tmp;

        // int snprintf(char *str, size_t size, const char *format, …);
        if (snprintf(buf, size, "%.*g", i, d) >= size) {
            break;
        }

        sscanf(buf, "%lf", &tmp);
        
        if (tmp == d) {
            break;
        }
    }
}


int main() {
    char str[16] = "";
    double d = 23445.938076;
    
    double_to_string(str, 16, d);
    
    puts(str);

    return 0;
}




/*
run:

23445.938076

*/

 

Cleaner teeth, healthier you!
Get The Secret to a Bright and Healthy Smile