switch报错
下面这段代码计算某一天是一年中的第几天。switch的第七个case开始报错。删掉case 7 ~ case 12则可以运行。报错：||=== Build: Debug in project (compiler: GNU GCC Compiler) ===|
D:\myCODE\c\project\main.c||In function 'Days':|
D:\myCODE\c\project\main.c|19|error: lvalue required as increment operand|
D:\myCODE\c\project\main.c|19|error: expected ';' before numeric constant|
D:\myCODE\c\project\main.c|20|error: lvalue required as increment operand|
D:\myCODE\c\project\main.c|20|error: expected ';' before numeric constant|
D:\myCODE\c\project\main.c|21|error: lvalue required as increment operand|
D:\myCODE\c\project\main.c|21|error: expected ';' before numeric constant|
D:\myCODE\c\project\main.c|22|error: lvalue required as increment operand|
D:\myCODE\c\project\main.c|22|error: expected ';' before numeric constant|
D:\myCODE\c\project\main.c|23|error: lvalue required as increment operand|
D:\myCODE\c\project\main.c|23|error: expected ';' before numeric constant|
D:\myCODE\c\project\main.c|24|error: lvalue required as increment operand|
D:\myCODE\c\project\main.c|24|error: expected ';' before numeric constant|
D:\myCODE\c\project\main.c||In function 'main':|
D:\myCODE\c\project\main.c|42|error: expected expression before '=' token|
||=== Build failed: 13 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdarg.h>
int Days(int *a, int *b);
int Days(int *a, int *b){
unsigned int x = *a;
int y = *b;
int days;
switch(x){
case 1: days = y;break;
case 2: days = 31+y;break;
case 3: days = 31+28+y;break;
case 4: days = 31+28+31+y;break;
case 5: days = 31+28+31+30+y;break;
case 6: days = 31+28+31+30+31+y;break;
case 7: days = 31+28+31+30++31+30+y;break; //从这里开始会报错
case 8: days = 31+28+31+30++31+30+31+y;break;
case 9: days = 31+28+31+30++31+30+31+31+y;break;
case 10: days = 31+28+31+30++31+30+31+31+30+y;break;
case 11: days = 31+28+31+30++31+30+31+31+30+31+y;break;
case 12: days = 31+28+31+30++31+30+31+31+30+31+30+y;break;
default: break;
}
return days;
}
int main(void)
{
int year, month, day;
int DAY;
printf("please enter year-month-day.eg: 1995-5-3");
scanf("%d-%d-%d",&year, &month, &day);
if(year%4 ==0 || year%400 == 0){
DAY = Days(&month, &day) + 1;
printf("this is the %d th day of %d", DAY, year);
}
else
printf("this is the %d th day of %d", Days(&month, &day), year);
return = 0;
}
代码有问题，试试这样：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdarg.h>
int Days(int *a, int *b);
int Days(int *a, int *b){
unsigned int x = *a;
int y = *b;
int days;
switch(x){
case 1: days = y;break;
case 2: days = 31+y;break;
case 3: days = 31+28+y;break;
case 4: days = 31+28+31+y;break;
case 5: days = 31+28+31+30+y;break;
case 6: days = 31+28+31+30+31+y;break;
case 7: days = 31+28+31+30+31+30+y;break;
case 8: days = 31+28+31+30+31+30+31+y;break;
case 9: days = 31+28+31+30+31+30+31+31+y;break;
case 10: days = 31+28+31+30+31+30+31+31+30+y;break;
case 11: days = 31+28+31+30+31+30+31+31+30+31+y;break;
case 12: days = 31+28+31+30+31+30+31+31+30+31+30+y;break;
default: break;
}
return days;
}
int main(void)
{
int year, month, day;
int DAY;
printf("please enter year-month-day.eg: 1995-5-3");
scanf("%d-%d-%d",&year, &month, &day);
if(year%4 ==0 || year%400 == 0){
DAY = Days(&month, &day) + 1;
printf("this is the %d th day of %d", DAY, year);
}
else
printf("this is the %d th day of %d", Days(&month, &day), year);
return 0;
} zltzlt 发表于 2020-1-4 14:57
代码有问题，试试这样：
谢谢，你这样是正确运行的。请问改动了哪里？ zhuwei9999 发表于 2020-1-4 15:03
谢谢，你这样是正确运行的。请问改动了哪里？
case 7: days = 31+28+31+30++31+30+y;break;
case 8: days = 31+28+31+30++31+30+31+y;break;
case 9: days = 31+28+31+30++31+30+31+31+y;break;
case 10: days = 31+28+31+30++31+30+31+31+30+y;break;
case 11: days = 31+28+31+30++31+30+31+31+30+31+y;break;
case 12: days = 31+28+31+30++31+30+31+31+30+31+30+y;break;
还有程序最后：
return = 0; zltzlt 发表于 2020-1-4 15:05
case 7: days = 31+28+31+30++31+30+y;break;
case 8: days = 31+28+31+30++31+30+31 ...
谢谢，我太粗心了
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