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
6R 1P 2G 3r 1p 2g 3
样例输出
191810-17-14-4
#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); }}