Converting pointer to float.

This is a discussion on Converting pointer to float. within the C Programming forums, part of the General Programming Boards category; I've assigned a number into character pointer: Code: char* strNumSet = "12.33"; I want to convert pointer strNumSet into float. ...

  1. #1
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    Converting pointer to float.

    I've assigned a number into character pointer:

    Code:
    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.

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  3. #3
    spurious conceit MK27's Avatar
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    strtofl():
    Code:
    #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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