getting correct ans on my pc compiler of question link text bt showing wrong ans on codechef . please help ..code is in c language

include<stdio.h>

int main() {

int n,i,j,top=-1;

char a[400],stack[400];
char temp;
scanf("%d",&n);
for(j=0;j<n;j++)
{
    scanf("%s",&a);

for(i=0;i<strlen(a);i++)
{
    while(a[i]=='(')
    {
        i++;
    }

    if(a[i]=='+' || a[i]=='-' || a[i]=='/' || a[i]=='*' || a[i]=='^')
        {
            temp=a[i];
            top++;
            stack[top]=temp;

        }
        else
            if(a[i]==')')
        {
            printf("%c",stack[top]);
            --top;


        }
        else
            printf("%c",a[i]);

        if(i==(strlen(a)-1) && top>-1)
        {
            printf("%c",stack[top]);
        }
}}
return 0;

}