How can i convert negative number to positive number ?

This is a discussion on How can i convert negative number to positive number ? within the C Programming forums, part of the General Programming Boards category; How can i make in such a way that the negative is ignored before adding up the number ?? Eg: ...

  1. #1
    Registered User
    Join Date
    Mar 2004
    Posts
    41

    How can i convert negative number to positive number ?

    How can i make in such a way that the negative is ignored before adding up the number ??

    Eg: I want the following the code to print out 13 instead of -1.

    Code:
       
    double hello[]={-1,2,4,-6};
    
    for(i=0; i<=3; i++)
    {
         xxx = xxx + hello[i];
    }
    
    printf("%f",xxx);

  2. #2
    Registered User
    Join Date
    Apr 2004
    Posts
    11
    Code:
    double hello[]={-1,2,4,-6};
    
    for(i=0; i<=3; i++)
    {
         if(hello[i] < 0)
             xxx -= hello[i];        /*  ex: x = x - (-1) */
         else
             xxx += hello[i];       /* ex: x = x + 2 */
    }
    
    printf("%f",xxx);

  3. #3
    Registered User
    Join Date
    May 2004
    Posts
    127
    You can use fabs from <math.h>.
    Code:
    #include <stdio.h>
    #include <math.h>
    
    int main(void)
    {
      double hello[]={-1,2,4,-6};
      double xxx = 0;
      int i;
    
      for(i=0; i<=3; i++)
      {
        xxx = xxx + fabs(hello[i]);
      }
    
      printf("%f",xxx);
    
      return 0;
    }
    Also note that your loop is not idiomatic. Most readers will see any deviation from the customary "for (i = 0; i < n; i++)" as a probable error. Your loop is correct, but would be better as "for (i=0; i<4; i++)".

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