for循环语句有问题啊，该怎么弄

[pasflau]

#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;
}

[destory27]

#include<stdio.h> int main() { char ch; char 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' || ch == 'A') { printf("输入要转换的字符："); fflush(stdin); for (fflush(stdin);(wrs = getchar()) != '\n'; ){ wrs = wrs + 2; printf("%d", wrs); } } else { printf("输入要转换的字符："); fflush(stdin); for (; wrs != '\n'; wrs = getchar()) wrs = wrs - 2; printf("%d", wrs); } return 0; }

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