strtof - C stdlib.h

Type

function

From


<cstdlib>
<stdlib.h>

Description

Convert string to float and returns its value as a float.

Prototype

float strtof (const char* str, char** endptr);

Parameters

Parameter	Description
str	C-string representation of a floating-point number.
endptr	char* to the next character in str after the numerical value. This parameter can be a null pointer if it is not used.

Return Value

On success, the function returns the converted floating point number as a value of type float.

For non valid conversion, the function returns zero 0.0F.

For out of the range values, a positive or negative HUGE_VALF is returned, and errno is set to ERANGE.

Demo Code


#include <stdio.h>
#include <stdlib.h>

int main ()/*from w  w  w. j a v a 2 s.  com*/
{
  char str[] = "1234.97 6543.24 test";
  char* pEnd;
  float f1, f2;
  
  f1 = strtof (str, &pEnd);
  
  f2 = strtof (pEnd, NULL);
  
  printf ("%f\n", f1);
  
  printf ("%f\n", f2);
  return 0;
}