c语言根据用户输入的出生年份并计算出当前年龄_C/C++

询问用户的出生年份并计算他们在当年的年龄。

代码一

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#include <stdio.h>
#define CURRENTYEAR 2023
 
int main()
{
    int yearBorn, age;
    printf("What year were you born?\n");
    scanf(" %d", &yearBorn);
 
    if (yearBorn > CURRENTYEAR){
        printf("wrong input!\n");
        printf("What year were you born?\n");
        scanf(" %d", &yearBorn);
    }
 
    age = CURRENTYEAR - yearBorn;
    printf("\nSo this year you will turn %d on your birthday!\n",age);
 
    if ((yearBorn % 4) == 0){
        printf("\nYou were born in a Leap Year--cool!\n");
    }
    return 0;
}

代码二

输入当前日期，生日计算你现在年龄

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#include<stdio.h>
int main()
{
    int y0,m0,d0;
    int y1,m1,d1;
    int y,m,d;
    printf("请输入学生的生日(年：y0.月：m0.日：d0)\n");
    printf("请输入当前日期(年：y0.月：m0.日：d0)\n");
    scanf("%d%d%d",&y0,&m0,&d0);
    scanf("%d%d%d",&y1,&m1,&d1);
    if(d1<d0)
        {
            m1--;//m1=m1-1,m1-=1
            switch(m1)
            {
            case 2:d=d1+28-d0;break;
            case 4:d=d1+30-d0;break;
            case 6:d=d1+30-d0;break;
            case 9:d=d1+30-d0;break;
            case 11:d=d1+30-d0;break;
            }
        }
    else
            d=d1-d0;
    if(m1<m0)
        {
        y1--;
        m=m1+12-m0;
        }
    else
        {
        m=m1-m0;
        y=y1-y0;
        }
 
printf("实际年龄为：年=%d,月=%d,日=%d",y,m,d);
return 0;
}

代码三

输入一个人的出生年月日及当前年月日求那个人现在的年龄，注意平年、闰年的判断。

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#include<stdio.h>                        //定义了三个变量类型、一些宏和各种函数来执行输入和输出
 
int main() {
    int year, month, day, newyear, newmonth, newday, wang;                        //定义出生和当前的年、月、日
    printf("请输入生日(包含年月日，请用空格隔开)：\n");
    scanf_s("%d %d %d", &year, &month, &day);
    printf("请输入当前日期(包含年月日，请用空格隔开)：\n");
    scanf_s("%d %d %d", &newyear, &newmonth, &newday);
    wang = newyear - year;                        //用当前年份减去出生年份，并赋值给wang
    if (newmonth - month > 0) {                    //如果出生月份大于当前月份，则直接输出
        printf("当前年龄为：\n");
        printf("%d\n", wang);
    }
    else {
        if (newmonth - month == 0) {            //如果月份相减等于0，则执行日的判断
            if (newday >= day) {                //如果当前日大于出生的日，则输出
                printf("当前年龄为：\n");
                printf("%d\n", wang);
            }
            else {
                printf("当前年龄为：\n");
                printf("%d\n", wang - 1);        //如果日期相减条件为假，则wang减去1
            }
        }
        else {
            printf("当前年龄为：\n");
            printf("%d\n", wang - 1);            //如果月份相减条件为假，则wang减去1
        }
    }
    return 0;
}

代码四

根据出生日期计算年龄或者根据身份证号计算年龄

可以把这个方法写成一个工具类方便以后在项目中调用，以下是写好的方法可以直接拿去用
注：（此方法计算的是虚岁年龄不是实岁年龄）

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//根据身份证号计算年龄
//身份证号
//String certNo = "430181200003161010";
//String birthTimeString = certN.substring(6,10)+"-"+certNo.substring(10,12)+"-"+certNo.substring(12,14);
//生日日期
String birthTimeString = "2022-03-16"; 
// 先截取到字符串中的年、月、日
String strs[] = birthTimeString.trim().split("-");
int selectYear = Integer.parseInt(strs[0]);
int selectMonth = Integer.parseInt(strs[1]);
int selectDay = Integer.parseInt(strs[2]);
// 得到当前时间的年、月、日
Calendar cal = Calendar.getInstance();
int yearNow = cal.get(Calendar.YEAR);
int monthNow = cal.get(Calendar.MONTH) + 1;
int dayNow = cal.get(Calendar.DATE);
 
// 用当前年月日减去生日年月日
int yearMinus = yearNow - selectYear;
int monthMinus = monthNow - selectMonth;
int dayMinus = dayNow - selectDay;
 
int age = yearMinus;// 先大致赋值
if (yearMinus < 0) {// 选了未来的年份
    age = 0;
} else if (yearMinus == 0) {// 同年的，要么为1，要么为0
    if (monthMinus < 0) {// 选了未来的月份
        age = 0;
    } else if (monthMinus == 0) {// 同月份的
        if (dayMinus < 0) {// 选了未来的日期
            age = 0;
        } else if (dayMinus >= 0) {
            age = 1;
        }
    } else if (monthMinus > 0) {
        age = 1;
    }
} else if (yearMinus > 0) {
    if (monthMinus < 0) {// 当前月>生日月
    } else if (monthMinus == 0) {// 同月份的，再根据日期计算年龄
        if (dayMinus < 0) {
        } else if (dayMinus >= 0) {
            age = age + 1;
        }
    } else if (monthMinus > 0) {
        age = age + 1;
    }
}
System.out.println(age );