C语言Calculate_age_when_Trump_elected函数功能异常求助

Let's break down the problems in your code and fix them step by step:

1. Incorrect Return Value in Calculate_age_when_Trump_elected #

Your function correctly computes the age as YEAR_TRUMP_ELECTED - year_born, but then you return 0 instead of the calculated result. This means the function never actually sends back the age value you worked out!

2. Wrong Variable Used in printf #

In your main function, you assign the function's result to age_when_Trump_elected, but then you print year_born (the user's birth year) instead of this computed variable. That's why the output only shows the birth year instead of the age when Trump was elected.

Fixed Code #

#include <stdio.h>
#include <ctype.h>
#include <stdbool.h>
#include "terminal_user_input.c"
#define YEAR_TRUMP_ELECTED 2016

// A very basic read boolean function
bool read_boolean(const char* prompt) {
    my_string answer;
    bool result;
    answer = read_string(prompt);
    answer.str[0] = (char) tolower(answer.str[0]);
    switch (answer.str[0]) {
        case 'n':
            result = false;
            break;
        case 'x':
            result = false;
            break;
        default:
            result = true;
    }
    return result;
}

int Calculate_age_when_Trump_elected(int year_born) {
    int result;
    result = YEAR_TRUMP_ELECTED - year_born;
    return result; // Return the computed age instead of 0
}

int main() {
    my_string name;
    int age_when_Trump_elected;
    int year_born;
    bool brexiter;

    name = read_string("What is your name? ");
    year_born = read_integer("When were you born? ");
    age_when_Trump_elected = Calculate_age_when_Trump_elected(year_born);
    printf("You were %d years old when Trump was elected\n", age_when_Trump_elected); // Use the correct variable here
    brexiter = read_boolean("Are you a Brexit supporter? ");

    if (brexiter == true) {
        printf("%s is a Brexit supporter\n", name.str);
    } else {
        printf("%s isn't a Brexit supporter\n", name.str);
    }

    read_string("Type 'exit' to continue ");
    return 0;
}

Key Changes Explained #

• In Calculate_age_when_Trump_elected: Swapped return 0; with return result; so the function returns the actual age calculation instead of a dummy value.
• In main's printf: Replaced year_born with age_when_Trump_elected to print the computed age, not the birth year.
• Small grammar fixes: Adjusted prompts like "When you were born?" → "When were you born?" and "Are u a Brexit support?" → "Are you a Brexit supporter?" for clarity (these don't affect functionality but make the program more user-friendly).

内容的提问来源于stack exchange，提问作者Chi Kit Chek