Hey guys!
I'm new to the forums and C overall
I'm learning for a degree in Math and computer Sciences and I've stumbeled across something I Can't seem to debug... (First semester lol, a noob still).
Well the program needs to get a list of IDs until it reaches EOF, and does some algorithm on it. if the ID is abcde, then ((a+b)*3+(c+d)*7)%10 should be like "e" in the original ID.
The first input, everything goes ok but on the second one and so forth it seems as tho there is a problem.... my Array might be getting messed up?
Some directions will be well appreciated
Edit:
just to make things clear:
ID that is invalid - prints a warning.
ID that doesn't follow the calculating rule - Printing it and saying it's incorrect.
ID that is correct - doesn't do anything
Here's the program:
Code:int main() { int counter=0, id, fail, loop=2; int ids[5] = {0,0,0,0,0}; int sum=0,last=0; printf("Enter list of IDs\n"); while (loop==2) { counter=0; fail=0; id=0; sum=0; last=0; while (counter<5) //Gets 5 chars!!! { id=getchar(); ids[counter] = (id-'0'); if ((id)== EOF) { return 0; } if ((id<'0') || (id>'9')) { fail=2; } if ((fail==2) && (counter==4)) { printf("invalid input, it should be 5 digits (0-9)\n"); fail=0; counter=0; while (counter<5) //Array reset!!! { ids[counter] = 0; counter+=1; } counter=0; continue; } counter+=1; } counter=0; sum+= ((ids[0]+ids[1])*3); sum+= ((ids[2]+ids[3])*7); sum%=10; last= (ids[0] * 10000); last+=(ids[1] * 1000); last+=(ids[2] * 100); last+=(ids[3] * 10); last+=(ids[4]); if (sum==(ids[4])) { sum=0; } else { printf("incorrect id: %d\n", last); sum=0; last=0; } while (counter<5) //Array reset!!! { ids[counter] = 0; counter+=1; } } return 0; }
Originally Posted by Shurik
