Overview: Intel's Numeric String Conversion Library

Intel's Numeric String Conversion Library, libistrconv, provides a collection of routines for converting between ASCII strings and C data types, which are optimized for performance. The istrconv.h header file declares prototypes for the library functions.

You can link the libistrconv library as a static or shared library on Linux* and OS X* platforms. On Windows* platforms, you must link libistrconv as a static library only.

// conv.c 
#include <stdio.h> 
#include <istrconv.h> 
#define LENGTH 20 

int main() {
 const char pi[] = "3.14159265358979323";
 char s[LENGTH];
 int prec;
 float fx;
 double dx;
 printf("PI: %s\n", pi);
 printf("single-precision\n");
 fx = __IML_string_to_float(pi, NULL);
 prec = 6;
 __IML_float_to_string(s, LENGTH, prec, fx);
 printf("prec: %2d, val: %s\n", prec, s);
 printf("double-precision\n");
 dx = __IML_string_to_double(pi, NULL);
 prec = 15;
 __IML_double_to_string(s, LENGTH, prec, dx);
 printf("prec: %2d, val: %s\n", prec, s);	
 return 0; 
}

To compile the conv.c file on Linux* platforms, use the following command:

icc conv.c –libistrconv 

To compile the conv.c file on OS X* platforms, use the following command:

icc conv.c –libistrconv   // with EDG compiler

icl conv.c –libistrconv   // with CLANG compiler

To compile the conv.c file on Windows* platforms, use the following command:

icl conv.c libistrconv.lib

After you compile this example and run the program, you should get the following results:

PI: 3.14159265358979323 

single-precision		
prec: 6, val: 3.14159 

double-precision		
prec: 15, val: 3.14159265358979