C Program Using Getchar And Putchar
Hello everyone, I'm having some issues with this. I have to make a calculator program that has 5 different functions (this is obviously the easy part, once all the input is assigned to their respective variables), which are addition, subtraction, mod, multiplication and division (negatives are not allowed, and must be error-checked; spaces must be ignored).
Putchar(), getchar() function in C Prev Next putchar() function is a file handling function in C programming language which is used to write a character on standard output/screen. Getchar() function is used to get/read a character from keyboard input. Mar 18, 2016 Hello, Beginning C programming and first time C programming lessons ever. The code below is for a C calculator using putchar/getchar. In the code below, what would be the best way to account for space/multiple spaces before input, space/multiple spaces between the digits and operand, no spaces between operand and digits, and spaces after input by the user is complete.
I need to take the equation from the user, echo it back and then solve the problem. If you guys could help point me in the right direction, I would definitely appreciate it. Not asking for anyone to do my work, just to help me understand the key concepts/points here.
Psychology 8th edition gleitman gross reisberg pdf files. Code: int read_operand(int *operand);This function would read characters from standard input using getchar, compute the integer value from the characters read, then store the result into the object that operand points to. It will return an error code to denote the specific error encountered (e.g., non-numeric input other than spaces were encountered, or the number read is negative), or if you prefer, you can just get it to return 1 on success and 0 on failure.
Remember to give the error code values descriptive names. (Also, you could consider using an enum type instead of int.) Then, I would write another function. Code: int read_operator(char *operator);This function would read a character from standard input using getchar and store the result into the object that operator points to, if it is a valid operand. In your current code, you have the operator as an int, but I assume that is a mistake: getchar returns an int because it could return EOF, which is negative, whereas char could be unsigned, so you should not make operator an int just because you call getchar to read its value. Like read_operand, read_operator would return an error code (or a boolean value) so that the caller can take action, e.g., continue with the reading/calculation or halt with an error message. Once you have written and tested these two functions, it should be easy to actually do the computation, as you noted.
EDIT: Oh, and then you can write another function. I'm still having some issues. I actually got this to work, in the sense that I was able to use printf to output input1, operand and input2 variables (i.e. I was at least getting the first part correct). Now, I'm not sure what I'm doing, but when I try to input any numbers, I get the error on line # 38, that a number was not inputted. I just want to get this darn thing working as it is right now for my morale, and once that's done, I can start working on reading the numbers with putchar.