Create Function Input

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This is simple program in C that show you how to create function input(scanf) to avoid an error when user input information:

Source Code

#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
#include<conio.h>
float inputf(){
    int i=0,f=-1;         
    char result[50]="",key;              
    _setcursortype(2);
    do{
        key=getch();
        if(isdigit(key)||(key=='.'&&f==-1)){ 
            if(key=='.')
                f=i;
            result[i++]=key;
            printf("%c",key);
        }
        if(key==8&&i>0){
            result[--i]='\0';
            if(i==f)       
                f=-1;     
            printf("\b \b");  
        }
    }while((key!=13||i==0)); 
    _setcursortype(0);
    return atof(result);
}
void main(){
    float number;
    clrscr();
    printf("Input:");
    number=inputf();
    gotoxy(34,13);printf("%f",number);
    getch();
}

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