What's going on here? It seems that the program isn't waiting for me to input a character, but just skips right to the 2nd number. It's almost like it's taking the newline from num1, except i am using fflush(stdin) so it shouldn't be doing that. Notice that the 3 printf statements i put in there to show me what is going on, the one for operator comes up with a blank line meaning I think either space or new line... There may be problems with my if/else if, but I won't be able to work on it until my program deals with the operator first. I'd like to concentrate on that, even if you see a problem with my if/else if structure. Here is the program & output follows it:
The Debugger has exited with status 0.Code:#include <stdio.h> int main (void) { /* declare variables */ /* ***************** */ float num1, num2, result; char oper = '+'; /* display greeting */ /* and get info */ /* **************** */ printf("Welcome to the Acme Simple Calculator!\n"); printf("Enter a number: "); scanf("%f", &num1); fflush(stdin); printf("num1 = %f\n", num1); printf("Enter a math operation +, -, *, /: \n"); oper = getchar(); printf("The operator is %c", oper); fflush(stdin); printf("Enter a second number: "); scanf("%f", &num2); fflush(stdin); printf("num2 = %f\n", num2); /* calculate results */ /* & display results */ /* ***************** */ if ( oper = '+' ) result = num1 + num2; else if ( oper = '-' ) result = num1 - num2; else if ( oper = '*' ) result = num1 * num2; else if ( oper = '/' ) result = num1 / num2; else printf("Invalid operator.\n"); return 0; } /* end main */ [Session started at 2010-04-26 21:52:34 -0700.] Welcome to the Acme Simple Calculator! Enter a number: 3.5 num1 = 3.500000 Enter a math operation +, -, *, /: The operator is Enter a second number: 9.7 num2 = 9.700000
