String : string formatted data read/write

Question

Write formatted data to string

Answer 1

Write formatted data to string

int sprintf ( char * str, const char * format, ... );

use sprintf function to write float data to string.

#include <stdio.h>

int main ()

{  

char buffer [50];  

double PI = 3.1415926;  

sprintf (buffer, "PI = %.7f", PI);  

printf ("%s\n",buffer);  return 0;

}

Read formatted data from string

int sscanf ( const char * s, const char * format, ...);

use sscanffunction to parse formatted data.

#include <stdio.h>

int main ()

{  

char sentence []="date : 06-06-2012";  

char str [50];  

int year;  

int month;  

int day;  

sscanf (sentence,"%s : %2d-%2d-%4d", str, &day, &month, &year);  

printf ("%s -> %02d-%02d-%4d\n",str, day, month, year);  

return 0;

}