#include<stdio.h>
void main()
{
    int a[10];
    for(int i=0;i<10;i++)
    scanf("%d",&a[i]);
    printf("\n");
    for(int j=0;j<10;j++)
    printf("%d",a[i]);
    printf("\n");
}

不好意思，写错了，是j，请指点一下！

e:\download\notepad++\test.c(7) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(7) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(7) : error C2143: syntax error : missing ')' before 'type'
e:\download\notepad++\test.c(7) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(7) : error C2065: 'i' : undeclared identifier
e:\download\notepad++\test.c(7) : warning C4552: '<' : operator has no effect; expected operator with side-effect
e:\download\notepad++\test.c(7) : error C2059: syntax error : ')'
e:\download\notepad++\test.c(8) : error C2146: syntax error : missing ';' before identifier 'scanf'
e:\download\notepad++\test.c(10) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(10) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(10) : error C2143: syntax error : missing ')' before 'type'
e:\download\notepad++\test.c(10) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(10) : error C2065: 'j' : undeclared identifier
e:\download\notepad++\test.c(10) : warning C4552: '<' : operator has no effect; expected operator with side-effect
e:\download\notepad++\test.c(10) : error C2059: syntax error : ')'
e:\download\notepad++\test.c(11) : error C2146: syntax error : missing ';' before identifier 'printf'

e:\download\notepad++\test.c(7) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(7) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(7) : error C2143: syntax error : missing ')' before 'type'
e:\download\notepad++\test.c(7) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(7) : error C2065: 'i' : undeclared identifier
e:\download\notepad++\test.c(7) : warning C4552: '<' : operator has no effect; expected operator with side-effect
e:\download\notepad++\test.c(7) : error C2059: syntax error : ')'
e:\download\notepad++\test.c(8) : error C2146: syntax error : missing ';' before identifier 'scanf'
e:\download\notepad++\test.c(10) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(10) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(10) : error C2143: syntax error : missing ')' before 'type'
e:\download\notepad++\test.c(10) : error C2143: syntax error : missing ';' before 'type'
e:\download\notepad++\test.c(10) : error C2065: 'j' : undeclared identifier
e:\download\notepad++\test.c(10) : warning C4552: '<' : operator has no effect; expected operator with side-effect
e:\download\notepad++\test.c(10) : error C2059: syntax error : ')'
e:\download\notepad++\test.c(11) : error C2146: syntax error : missing ';' before identifier 'printf'

我就是在两个for循环里分别定义啊，但是运行就是出错！要是在开头定义int i，j就没错。