(完整版)全国计算机等级考试二级教程--C语言程序设计课后习题答案

{

if(day > 28) {

printf(\输入的出生日期无效!\\n\ return 0; } } break;

}/* end of switch(m0)*/ } return 1; }

void main() {

int y0, m0, d0; /* 生日 */ int y1, m1, d1; /* 当前日期 */ int years, months, days; /* 实足年龄*/

printf(\请输入学生的生日:\ scanf(\

if(checkdate(y0, m0, d0)) {

printf(\请输入当前日期:\ scanf(\ /*当前日期合法性检查*/ if(!checkdate(y1, m1, d1)) { return; }

else if(y0 > y1) {

printf(\出生年份比当前年份晚!\\n\ return; }

else if(y0 == y1) {

if(m0 > m1) {

printf(\出生年月比当前年月晚!\\n\ return; }

else if(m0 == m1)

{

if(d0 > d1) {

printf(\出生年月日比当前年月日晚!\\n\ return; } } } }

/* 计算实足年龄 */ years = y1 - y0; months = m1 - m0; days = d1 - d0;

/* 修正实足年龄天数*/ if(days < 0) { months--; switch(m1) { case 1: case 5: case 7: case 10: case 12: days += 30; break; case 2: case 4: case 6: case 8: case 9: case 11: days += 31; break; case 3:

if((y1%4 == 0 && y10 != 0) || y1@0 == 0) {

days += 29; } else {

days += 28;

} break;

}/* end of switch(m1) */

}/* end of if(days < 0) */

/* 修正实足年龄月数*/ if(months < 0) {

months += 12; years--;

}/* end of if(months < 0) */

printf(\出生日期: %d年%d月%d日\\n\ printf(\当前日期: %d年%d月%d日\\n\

printf(\实足年龄: %d年%d月%d日\\n\ return; } 4.23 #include

void main() { int a;

printf (\请输入一个整数 :\ scanf (\ if (a%2==0) {

printf (\是偶数\\n\ } else {

printf (\是奇数\\n\ } } 4.24 #include

void main() {

int a,b,c,temp,max;

printf (\请输入三个整数 :\ scanf (\ temp=(a>b)? a:b; max=(temp>c)? temp:c; printf (\

printf (\你输入的数中最大的是 %d.\\n\ } 4.25

(1)不嵌套的if语句 #include

void main() { int x,y;

printf(\ scanf(\ if ( x>-5 && x<0 ) {

printf(\ }

if ( x==0 ) {

printf(\ }

if ( x>0 && x<10 ) {

printf(\ }

if ( x>=10 || x<=-5) {

printf(\ } }

(2)嵌套的if语句 #include

void main() { int x,y;

printf(\ scanf(\ printf(\ if(x < 0)