C++(www.cppentry.com)中,变量定义可以在函数中的任意位置,比如函数中任意位置出现的For循环中: for(int i = 0; i< len; i++) { /*do something;*/ } 变量i就可以在使用到的地方才给定义; 然而在C语言中,变量的定义一定要在函数体的最开始处; 否则在使用到变量的地方才定义,编译的时候会报不认识此变量,如下这个屏幕字段入口函数: Fi_120015_01_CICUSENA() { char acRegFlg[2]; GetStr(“K_C00101”,acRegFlg); Trim(acRegFlg); /*非记名卡跳过 */ if(acRegFlg[0]=='0‘) { return SKIP; } /*判断输入的姓名是否为拼音*/ char Name[71]; int len = 0; GetStr(“CICUSENA”,Name); /*取数组长度*/ /* len = (sizeof(Name)/sizeof(Name[0])); */ len = strlen(Name); for(int i = 0; i < len; i++) { if(!((Name[i]>'A' && Name[i]<'Z’) || (Name[i]>'a' && Name[i]<'z‘))) { v_warning(0,“请输入姓名对应的拼音”); return INVALID; } } return 0; } 编译,然后就出现下面的错误: [开发]/usr/AAAAA/src/cds/120015>msoe ->编译 120015.fe …… 120015.c: “120015.ec”, line 248: error: Syntax error before or at: int “120015.ec”, line 250: error: undefined symbol: Name “120015.ec”, line 253: error: undefined symbol: len “120015.ec”, line 253: error: cannot dereference non-pointer type “120015.ec”, line 254: error: Syntax error before or at: int “120015.ec”, line 254: error: undefined symbol: i “120015.ec”, line 254: error: Syntax error before or at: ) “120015.ec”, line 260: error: Syntax error before or at: return “120015.ec”, line 260: warning: syntax violation: empty declaration 120015.c: “120015.ec”, line 248: error: Syntax error before or at: int “120015.ec”, line 250: error: undefined symbol: Name “120015.ec”, line 253: error: undefined symbol: len “120015.ec”, line 253: error: cannot dereference non-pointer type “120015.ec”, line 254: error: Syntax error before or at: int “120015.ec”, line 254: error: undefined symbol: i “120015.ec”, line 254: error: Syntax error before or at: ) “120015.ec”, line 260: error: Syntax error before or at: return “120015.ec”, line 260: warning: syntax violation: empty declaration *** Error code 2 (bu21) mv: cannot access 120015.so: No such file or directory (error 2) 当我们把所有的变量定义移动到函数体最上面,如下;然后进行编译,上面出现的问题就解决了: Fi_120015_01_CICUSENA() { char acRegFlg[2]; char Name[71]; int len = 0,i=0; GetStr(“K_C00101”,acRegFlg); Trim(acRegFlg); /*非记名卡跳过 */ if(acRegFlg[0]=='0’) { return SKIP; } /*判断输入的姓名是否为拼音*/ GetStr(“CICUSENA”,Name); /*取数组长度*/ len = strlen(Name); for(i = 0; i < len; i++) { if(!((Name[i]>'A' && Name[i]<'Z‘) || (Name[i]>'a' && Name[i]<'z’))) { v_warning(0,“请输入姓名对应的拼音”); return INVALID; } } return 0; } |