c语言，有关进制的，帮帮我

Ubuntu Pastebin https://pastebin.ubuntu.com/p/3z32hdKZZ5/

#include<stdio.h>
#include<string.h>
int main()
{
int t,a,b,i,j,k,x,y,sum1,sum2;
long long z;
char c[34],d[34];
scanf("%d",&t);
while(t--)
{
scanf("%s %d %s %d",c,&a,d,&b);
x=strlen(c);
y=strlen(d);
for(i=x-1,j=0,sum1=0;i>=0;i--,j++)
{
if( (c[i]<='z' && c[i]>='a') )
{
c[i]=c[i]-'a'+36;
}
if( (c[i]<='Z' && c[i]>='A') )
{
c[i]=c[i]-'A'+10;
}
if( (c[i]<=57 && c[i]>=48) )
{
c[i]=c[i]-48;
}
if(c[i]!='-')
{
for(z=a,k=0;k<=j;k++)
{
if(j==0){
z=1;
}else {
z*=a;
}
}
if(z==1){
sum1+=c[i]z;
} else {
sum1+=z/a/ac[i];
}
}
if(i==0)
{
if(c[0]=='-')
{
sum1=-sum1;
}
}

    }         
    
    for(i=y-1,j=0,sum2=0;i>=0;i--,j++)
    {    
        if( (d[i]<='z' && d[i]>='a') )
        {
            d[i]=d[i]-'a'+36;
        }
        if( (d[i]<='Z' && d[i]>='A') )
        {
            d[i]=d[i]-'A'+10;
        }
        if( (d[i]<=57 && d[i]>=48) )
        {
            d[i]=d[i]-48;
        }
        if(d[i]!='-')
        {
            for(z=b,k=0;k<=j;k++)
            {
                if(j==0){
                    z=1;
                }else {
                    z*=b;
                } 
            }
            if(z==1){
                sum2+=d[i]*z;
            } else {
                sum2+=z/b/b*d[i];
            }
            
        }
        if(i==0)
        {
            if(d[0]=='-')
            {
            sum2=-sum2;
            }
        }
        
    }
    
    printf("%d\n",sum1+sum2);
}
return 0;

}