a letter and a number

描述
we define f(A) = 1, f(a) = -1, f(B) = 2, f(b) = -2, ... f(Z) = 26, f(z) = -26;
Give you a letter x and a number y , you should output the result of y+f(x).
输入
On the first line, contains a number T(0<T<=10000).then T lines follow, each line is a case.each case contains a letter x and a number y(0<=y<1000).
输出
for each case, you should the result of y+f(x) on a line
样例输入
6
R 1
P 2
G 3
r 1
p 2
g 3

样例输出

19
18
10
-17
-14
-4

#include<stdio.h>
int main()
{
  int x,n;
scanf("%d",&x);
while(x--)
{
getchar();

char c;
scanf("%c %d",&c,&n);
if(c>=65&&c<=90) c=c-64;
else c=0-(c-96);
n=c+n;
printf("%d\n",n);
 
}
}