c - C语言中日期只能输入一个整数，不能输入年月日

Question

我想编写一个 C 程序，通过输入注册日期来计算汽车的使用年限。我只能使用一个 int 而不是日、月和年作为整数。如果整个日期都是 int，我如何只用年份来计数？

这是我的代码:

#include <stdio.h>

int main() {
        int inputDateOfFirstUse, ageCalculation, age;

        printf("\nProgram to calculate the age of a car");
        printf("\nPlease enter the date of the first use (in this syntax tt.mm.jjjj): ");
        scanf("%i", &inputDateOfFirstUse);
        ageCalculation = inputDateOfFirstUse - 2018;
        age = ageCalculation;
        printf("\nThe car is %i years old.", age);
        return 0;
}

Answer 1

在 scanf 中，您可以使用 %*i 语法来跳过您不关心的值。

#include <stdio.h>

int main() {
        int inputDateOfFirstUse, ageCalculation, age;

        printf("\nProgram to calculate the age of a car");
        printf("\nPlease enter the date of the first use (in this syntax tt.mm.jjjj): ");
        scanf("%*i.%*i.%i", &inputDateOfFirstUse); // Skips day and month, reads only year
        ageCalculation = 2018 - inputDateOfFirstUse;
        age = ageCalculation;
        printf("\nThe car is %i years old.", age);
        return 0;
}