Confusion regarding a program on structures

Question

#include <stdio.h>

main(void)
{
    struct computer
    {
        float cost;
        int year;
        int cpu_speed;
        char cpu_type[16];
    } model;

    printf(“The type of the CPU inside your computer?\n”);
    gets(model.cpu_type);
    printf(“The speed(MHz) of the CPU?\n”);
    scanf(“%d”, &model.cpu_speed);
    printf(“The year your computer was made?\n”);
    scanf(“%d”, &model.year);
    printf(“How much you paid for the computer?\n”);
    scanf(“%f”, &model.cost);

    printf(“Here are what you entered:\n”);
    printf(“Year: %d\n”, model.year);
    printf(“Cost: $%6.2f\n”, model.cost);
    printf(“CPU type: %s\n”, model.cpu_type);
    printf(“CPU speed: %d MHz\n”, model.cpu_speed);

    return 0;
}

The above code is from Teach Yourself C in 24 hours,but it shows stray errors while being run.

In the book,an output has also been displayed.

In the output,the cost of the model is $1234.56. How can 1234.56 fit into %6.2f... I mean for %6.2f we'll get only 234.56,right?

*"it shows stray errors"* What errors? [edit] and add *complete* error messages. Also, see [mcve]. — user694733, Apr 10 '17 at 13:17
Get a better textbook. Nobody should ever use `gets()`. Also, `main(void)` should be `int main(void)` — r3mainer, Apr 10 '17 at 13:19
/temp/file.cpp:12:2: error: stray ‘\342’ in program...and many more. — Susan, Apr 10 '17 at 13:19
[why-is-the-gets-function-so-dangerous-that-it-should-not-be-used](http://stackoverflow.com/questions/1694036/why-is-the-gets-function-so-dangerous-that-it-should-not-be-used) — LPs, Apr 10 '17 at 13:20
%6.2f means it'll have at least 6 digits and at most 2 decimal places - if the number is larger it'll take up more space. — Chris Turner, Apr 10 '17 at 13:21
@squeamishossifrage The program still displays errors,saying that 'The' has not been declared,in the first printf statement — Susan, Apr 10 '17 at 13:24
@Susan: No, not right. It will still be 1234.56 (see answer below, and Chris Turner's comment). — Scott Hunter, Apr 10 '17 at 13:24
@Susan That's because you're using printer's quotation marks, as others have already pointed out. — r3mainer, Apr 10 '17 at 13:26

taskinoor · Answer 1 · 2017-04-10T13:28:08.107

2

You have invalid character for double quote “ and ” which are causing the stray error. You probably have them copied them from some other site or pdf. Otherwise you need to check your keyboard setting.

The correct double quote is ".

edited Apr 10 '17 at 13:28

answered Apr 10 '17 at 13:21

taskinoor

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@ScottHunter The actual error is [this](http://ideone.com/yzBUrt) as commented by OP – LPs Apr 10 '17 at 13:23
@ScottHunter I have actually copied the source and compiled to see the error and fix. – taskinoor Apr 10 '17 at 13:23

score 1 · Answer 2 · answered Apr 10 '17 at 13:20

1

The 6 in %6.2f is the minimum field width.

answered Apr 10 '17 at 13:20

Scott Hunter

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Isn't it like this-we count 6 places and then 2 backwards(for 2 in 6.2) and then a place backward again for the decimal point? _ _ _ _. _ _ So there'll be 3 places before the decimal and 2 after it???If not,how actually do we count the places?? – Susan Apr 10 '17 at 13:32
1

`printf` never truncates the whole part of a floating point number. @Susan, please ask this as a separate question and you'll get more a detailed answer. – Apr 10 '17 at 14:43

score 0 · Answer 3 · answered Apr 10 '17 at 13:21

0

You used strange chars for strings: you used “ but you must use "

answered Apr 10 '17 at 13:21

LPs

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Confusion regarding a program on structures

3 Answers3