why no print___

[zcrself]

train.h

//PARSEPARA:parse para by step by step
int parseP(const char *a,float *p)
{
     float start,end,step;
     int pCount = 0;
     int pNum = 0;
     pNum = sscanf(a,"%f-%f-%f",&start,&end,&step);
     //printf("start:[%f]\n",start);
     
     if ( pNum < 3 ) 
     {
          printf("Error:format of windowSize,K-value,noequalPunish and percentRatio must be start-end-step.\n");
          exit(0);
     }
     if ( end < start )
     {
          printf("Error: end must be more than start in [%s]\n",a);
          exit(0);
     } else if ( step <= 0 )
     {
          printf("Error: step must be more than 0 in [%s]\n",a);
          exit(0);
     }
     
     //float j;
     while ( start <= end )
     {
           *p = start;
           start = start+step;
           p++;
           pCount++;
     }
     
     return pCount;
     //printf("pNum:%f\n",step);
}

zero.cpp

#include "train.h"
int main( int argc,char *argv[])
{
    float a[30] = {'\0'};
    parseP("0-5-1",a);
    
    for ( int i = 0; a[i] != '\0' ; i++ )
    {
        printf("a[%d]:%f\n",i,a[i]);
    }
    return 0;
}

If parseP("0-5-1",a); print is nothing
if parseP("1-5-1",a); print is as follows:
a[0]:1.000000
a[1]:2.000000
a[2]:3.000000
a[3]:4.000000
a[4]:5.000000


why ? how to solve this problem?

[Adak]

Your test condition prevents it from printing:

for(... a[i] != '\0' ; ...)

a[] is an array of floats, but '\0' is a char, and that char evaluates to 0. so when the first value in a[0] is zero, it stops looping right away.

Are you trying to print out a[] or the contents of parseP[]?