کمک در مورد رفع ایراد این سورس

با سلام به دوستان

من یه کمک اساسی در مورد ایراد این برنامه مه مربوط میشه به جمع 2 عدد float ، از دوستان خواهش میکنم زود کمک کنن که من برسم تحویل استاد بدم ، آخه پروژه منه !
فقط لطفا هرکی تونست ایرادشو رفع کنه و خودش تغییرات رو اعمال و سورسش رو اینجا بزاره ، خلاصه خیلی ممنون

کد:

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

int isNegative (float f)
{
    unsigned int* iptr = (unsigned int*)&f;
    return ( ((*iptr) & 0x80000000) ? 1:0);
}

unsigned char getExponent (float f)  // Purpose is to return the 8 bit exponent of the floating point value
{
        unsigned int* iptr = (unsigned int*)&f;
        return (((*iptr >> 23) & 0x7f)) ;
       
}

unsigned int getMantissa (float f) // Purpose to return the 24 bit mantissa of the floating point value.
{
        unsigned int* iptr = (unsigned int*)&f;
        if( *iptr == 0 ) return 0;
        return ((*iptr & 0xFFFFFF) | 0x800000 );
       
}

float sum (float left, float right) // Purpose to return the sum of the floating point values left & right .
{
      // Will obtain the exponents of the left & right and will obtain the mantissa.
      unsigned int littleMan;
      unsigned int bigMan;
      unsigned char littleExp;
      unsigned char bigExp;
      unsigned char lexp = getExponent(left);
      unsigned char rexp = getExponent(right);
     
   
 
if (lexp > rexp)
{
        bigExp = lexp;
        bigMan = getMantissa(left);
        littleExp = rexp;
        littleMan = getMantissa(right);
}
else
{
    bigExp = rexp;
    bigMan = getMantissa(right);
    littleExp = lexp;
    littleMan = getMantissa(left);
}


printf("little: %x %x\n", littleExp, littleMan);
printf("big:    %x %x\n", bigExp, bigMan);

//Purpose is to extract difference in exponet values to determin how much to shift the mantissa   
int expSub = (bigExp - littleExp);
printf("Subtraction of the Exp: %x\n", expSub);

// Purpose is shift the mantissas to allign binary points.
int shifta = (littleMan >> expSub);
printf("The value of the Exp after the shift:  %x\n", shifta);

// Purpose is add mantissas
int addMantissa = (bigMan + shifta);
printf("The value of the two Mantissas added:  %x\n", addMantissa); 


// If the mantissa is too big , extend into the 24 bit , shift over to fit mantissa and update bigExp to compensate for the shift and strip the hidden bit.
if (addMantissa > 0x7FFFFF)//0x7fffff)
{
    addMantissa = addMantissa >> 1;
    ++bigExp;
}


// Reassemble the floating point number

unsigned int result =  (expSub + 127)<<23 | (addMantissa & 0xfffff) ;
printf ("This is the addition:  %x\n", result);

float fresult = *(float*)&result;
return(fresult);

}

int main()
{
    const int SIZE = 256;
    char line[SIZE];
   
    while (1)
    {
          float f1;
          float f2;
          float left = f1;
          float right = f2;
         
          printf("Please enter the first float ( \"q\" to quit):");
          fgets(line,SIZE,stdin);
         
          if (toupper(line[0]) =='Q')
          break;
         
          f1 = atof(line);
         
          printf("Please enter the second float ( \"q\" to quit):");
          fgets(line,SIZE,stdin);
         
          if (toupper(line[0]) == 'Q')
          break;
         
          f2 = atof(line);
         
          if (isNegative(f1) || isNegative(f2))
          printf ("One of thse is negative, but %g + %g == %g\n", f1,f2,sum(f1,f2));
          else
          printf("%g + %g == %g\n", f1,f2,sum(f1,f2));
}

return(EXIT_SUCCESS);
}

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