foo.c:4:8: error: expected declaration specifiers or '...' before string constant
    4 |  scanf("%d%d%d",&year1,&month1,&day1);
      |        ^~~~~~~~
foo.c:4:17: error: expected declaration specifiers or '...' before '&' token
    4 |  scanf("%d%d%d",&year1,&month1,&day1);
      |                 ^
foo.c:4:24: error: expected declaration specifiers or '...' before '&' token
    4 |  scanf("%d%d%d",&year1,&month1,&day1);
      |                        ^
foo.c:4:32: error: expected declaration specifiers or '...' before '&' token
    4 |  scanf("%d%d%d",&year1,&month1,&day1);
      |                                ^
foo.c:5:8: error: expected declaration specifiers or '...' before string constant
    5 |  scanf("%d%d%d",&year2,&month2,&day2);
      |        ^~~~~~~~
foo.c:5:17: error: expected declaration specifiers or '...' before '&' token
    5 |  scanf("%d%d%d",&year2,&month2,&day2);
      |                 ^
foo.c:5:24: error: expected declaration specifiers or '...' before '&' token
    5 |  scanf("%d%d%d",&year2,&month2,&day2);
      |                        ^
foo.c:5:32: error: expected declaration specifiers or '...' before '&' token
    5 |  scanf("%d%d%d",&year2,&month2,&day2);
      |                                ^
foo.c:6:2: warning: data definition has no type or storage class
    6 |  leap1=(year1%400==0||year1%4==0&&year1%100!=0);//2020年不是闰年
      |  ^~~~~
foo.c:6:2: warning: type defaults to 'int' in declaration of 'leap1' [-Wimplicit-int]
foo.c:6:33: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    6 |  leap1=(year1%400==0||year1%4==0&&year1%100!=0);//2020年不是闰年
      |                       ~~~~~~~~~~^~~~~~~~~~~~~~
foo.c:6:8: error: initializer element is not constant
    6 |  leap1=(year1%400==0||year1%4==0&&year1%100!=0);//2020年不是闰年
      |        ^
foo.c:7:2: warning: data definition has no type or storage class
    7 |  leap2=(year2%400==0||year2%4==0&&year2%100!=0);
      |  ^~~~~
foo.c:7:2: warning: type defaults to 'int' in declaration of 'leap2' [-Wimplicit-int]
foo.c:7:33: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    7 |  leap2=(year2%400==0||year2%4==0&&year2%100!=0);
      |                       ~~~~~~~~~~^~~~~~~~~~~~~~
foo.c:7:8: error: initializer element is not constant
    7 |  leap2=(year2%400==0||year2%4==0&&year2%100!=0);
      |        ^
foo.c:8:3: error: expected identifier or '(' before 'for'
    8 |   for(i=1;i<month1;i++)
      |   ^~~
foo.c:8:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    8 |   for(i=1;i<month1;i++)
      |            ^
foo.c:8:21: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
    8 |   for(i=1;i<month1;i++)
      |                     ^~
foo.c:12:3: error: expected identifier or '(' before 'for'
   12 |   for(i=1;i<month2;i++)
      |   ^~~
foo.c:12:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
   12 |   for(i=1;i<month2;i++)
      |            ^
foo.c:12:21: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
   12 |   for(i=1;i<month2;i++)
      |                     ^~
foo.c:17:3: error: expected identifier or '(' before 'if'
   17 |   if(year1==year2)
      |   ^~
foo.c:28:3: error: expected identifier or '(' before 'if'
   28 |   if(year1!=year2)
      |   ^~
foo.c:47:2: error: expected identifier or '(' before 'return'
   47 |  return 0;
      |  ^~~~~~
foo.c:48:1: error: expected identifier or '(' before '}' token
   48 | }//首先判断一天到一月一日的时间距离
      | ^

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