see buddies i make a program in c but it take enter 1st number then ask for opearator and then directly tell that wrong opearator iam tired but i cant find where is problem here it is ::::: PHP: #include <conio.h> #include <math.h> #include <stdio.h> #define PI 3.14159265 int main() { float firstNumber, secondNumber; float resultSqrt, resultSin, resultCos, resultTan; char operation ,boolSqrt; printf("TITLE My Calculator Program."); printf(" *****************************************\n" ); printf(" Simple Calculator!\n" ); printf (" *****************************************\n\n"); printf( " OPERATORS : +, -, *, /, !, S, C, T\n"); printf( " \n"); printf (" + = ADD\n - = SUBTRACT\n * = Multiplication\n "); printf ("/ = Division\n ! = SQAURE ROOT\n S = SIN\n "); printf ("C = COS\n T = TAN\n"); printf(" \n ************************************************\n"); printf(" NOTE : YOU CAN USE X AND x FOR MULTIPLICATION!\n"); printf(" ************************************************\n\n"); printf( "\n ENTER FIRST NUMBER : "); scanf("%f",& firstNumber); printf("\n ENTER OPERATOR SIGN : "); scanf("%ch",& operation); resultSqrt = sqrt (firstNumber); resultSin = sin (firstNumber*PI/180); resultCos = cos (firstNumber*PI/180); resultTan = tan (firstNumber*PI/180); switch(operation) { case '+': printf("\n ENTER SECOND NUMBER : "); scanf("%f",& secondNumber); printf("\n Answer = ", firstNumber + secondNumber); break; case '-': printf("\n ENTER SECOND NUMBER : "); scanf("%f",& secondNumber); printf("\n Answer = ",firstNumber - secondNumber); break; case '*': case 'x': case 'X': printf("\n ENTER SECOND NUMBER : "); scanf("%f", & secondNumber); printf("\n Answer = ",firstNumber * secondNumber); break; case '/': printf("\n ENTER SECOND NUMBER : "); scanf("%f", & secondNumber); printf("\n Answer = ",firstNumber / secondNumber); break; case '!': printf("\n ANSWER = " , resultSqrt); break; case 'S': case 's': printf("\n ANSWER = " , resultSin); break; case 'C': case 'c': printf("\n ANSWER = " ,resultCos); break; case 'T': case 't': printf("\n ANSWER = " ,resultTan); break; default: printf("\n WRONG MATHMATICAL OPERATOR!"); break; } getch(); }
You need to change this: scanf("%ch",& operation); to this: scanf(" %c", &operation); I'm not sure what the 'h' was doing in there, but you definitely need a space before the %c to eat up the newline after entering the first number. Also, to print the answer you need to change this (and all similar lines): printf("\n Answer = ", firstNumber + secondNumber); to something like this printf("\n Answer = %f", firstNumber + secondNumber); (You forgot to put in the format specifier.) Moreover, you really need to fix the spacing of your code!
Anny, Please correct the mistakes pointed out in the previous post by oogabooga. Along with that you need to flush the input stream before taking the next input... Code: char ch; while((ch = getchar()) != EOF && ch != '\n'); Regards, Ahamed.
