for循环语句有问题啊,该怎么弄
#include<stdio.h>
int main()
{
char ch, wrs;
printf("请输入您要进行的功能(a/A加密,b/B解密):");
scanf("%c", &ch);
if (ch = 'a' || 'A')
{
printf("输入要转换的字符:");
for (;wrs != '\n'; wrs = getchar())
wrs = wrs + 2;
}
else
{
printf("输入要转换的字符:");
for (; wrs != '\n'; wrs = getchar())
wrs = wrs - 2;
}
printf("%d", wrs);
return 0;
}