请阅读下面的程序,分析程序是否能编绎通过并正确运行,如果不能,说明原因;如果能,请写出运行结果。#define LETTER 0int main(){char str[20] = "C language";int i = 0;while ((str[i])){#if LETTERif (str[i] >= 'a' && str[i] <= 'z'){str[i] = str[i] - 32;printf("%c", str[i]);}#elseif (str[i] >= 'A' && str[i] <= 'Z'){str[i] = str[i] + 32;printf("%c", str[i]);}#endifi++;}return 0;}