Code: /*PROGRAMMER: SOJITRA AADARSH DATE:22/8/2013 AGE: 16 YEARS E-MAIL: [email]adarshsojitra7@gmail.com[/email]*/ #include<stdio.h> /*include header files*/ #include<conio.h> /*include header files*/ main() { char ab[50]; float a,ans; char o; clrscr(); ans=0; printf("\n Press A for help"); while(1) { printf("\n\n Answer: %.3f",ans); printf("\n\n Enter opertor and number: "); fgets(ab,sizeof(ab),stdin); sscanf(ab,"%c %f",&o,&a); if((o=='a')||(o=='A')) { clrscr(); printf("\n Enter operator and number to calculate."); printf("\n Do not put space between operator and number."); printf("\n Enter N or n to quit."); printf("\n Press c or C to clear screen."); printf("\n To reset multiply with 0."); printf("\n You can calculate form -3.4e-38 to +3.4e-38."); printf("\n The answer will be 0 first time when you are calcutating from this window."); printf("\n\n Answer: %.3f",ans); printf("\n\n Enter opertor and number: "); fgets(ab,sizeof(ab),stdin); sscanf(ab,"%c %.3f",&o,&a); } if((o=='c')||(o=='C')) { clrscr(); printf("\n\n Answer: %.3f",ans); printf("\n\n Enter opertor and number: "); fgets(ab,sizeof(ab),stdin); sscanf(ab,"%c %.3f",&o,&a); } if((o=='N')||(o=='n')) { printf("\n\t\t\tPress any key to quit............"); break; } switch(o) { case'+':ans+=a; break; case'-':ans-=a; break; case'*':ans*=a; break; case'/':if(a==0) { printf("\n\t\t\t\t !ERROR!"); printf("\n\t\t\t Operation is cancelled"); } else { ans/=a; } break; default:printf("\n\n Error in operator"); break; } } getch(); return 0; } :cool:
