Thread: Converting pointer to float.

  1. #1
    Registered User
    Join Date
    Apr 2010

    Converting pointer to float.

    I've assigned a number into character pointer:

    char* strNumSet = "12.33";
    I want to convert pointer strNumSet into float. What is the correct way to do this?

    Kindly thanks for any suggestion and help.

  2. #2
    Registered User
    Join Date
    Sep 2004
    bit∙hub [bit-huhb] n. A source and destination for information.

  3. #3
    spurious conceit MK27's Avatar
    Join Date
    Jul 2008
    segmentation fault
    #include <stdio.h>
    #include <stdlib.h>
    int main(int argc, const char *argv[]) {
    	char s[] = "42.7";
    	float n = strtof(s,NULL);
    	printf("%s %f\n",s,n);
    	return 0;
    The slight imprecision which might be observable here is due to the nature of floating point numbers.

    If you are using gcc, you must compile -std=c99. Otherwise, you can use "string to double", strtod().
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

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