c programming language ___ 5_2.c

#include <stdio.h>
#include <ctype.h>
#define  BUG printf("here!bug!
");

int getfloat(float *pn){
    int c;
    int t;
    int intbeforepoint=0;
    int intafterpoint=0;
    int intafterpoint_lenth=0;
    int inte;
    int sign,esign;
    int ppoint;  // 1 means there have point ,otherwise no
    float res=0;

    while( isspace(c=getch()) )
        ;
    if(!isdigit(c)&&c!=EOF&&c!='+'&&c!='-'){
        ungetch();
        return 0;
    }
    sign=(c=='-')?-1:1;
    if(c=='+'||c=='-')
        c=getch();
    for(intbeforepoint=0;isdigit(c);c=getch())
        intbeforepoint=10*intbeforepoint+(c-'0');
    ppoint=0;
    if(c=='.'){
        ppoint=1;
        c=getch();
        for(intafterpoint=0;isdigit(c);c=getch()){
            intafterpoint=10*intafterpoint+(c-'0');
            intafterpoint_lenth++;
        }
        t=intafterpoint;
        while(t%10==0){
            intafterpoint_lenth--;
            t=t/10;
        }
    }
    if(c=='e'||c=='E'){
        c=getch();
        esign=1;
        if(c=='+'||c=='-'){
            esign= (c=='+')?1:-1;
            c=getch();
        }
        while( c=='0'){
            c=getch();
        }
        for(inte=0;isdigit(c);c=getch())
            inte=10*inte+(c-'0');
    }
    BUG;
    if(c!=EOF)
        ungetch(c);
    res=1.0*intbeforepoint;
    t=intafterpoint_lenth;
    while(t--)
        res*=10;
    res+=intafterpoint;
    t=intafterpoint_lenth;
    while(t--)
        res/=10;
    if(esign==-1){
        while(inte--)
            res/=10;
    }else if(esign==1){
        while(inte--)
            res*=10;
    }
    res*=sign;
    *pn=res;
    printf("intbeforepoint=%d
",intbeforepoint);
    printf("intafterpoint=%d
",intafterpoint);
    printf("inte=%d
",inte);
    printf("length=%d
",intafterpoint_lenth);
    return c;
}
int main(){
    float num[10];
    int i;
    for(i=0;i<10;++i){
        getfloat(&num[i]);
        printf("%lf
",num[i]);
    }
    return 0;
}