工程报如下错误: fatal error: file '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/ Developer/SDKs/iPhoneSimulator8.0.sdk/usr/include/sysexits.h' has been modifie
文章目录 1、Terms14:Think carefully about copying behavior in resource-managing classes方法一:禁止复制方法二:对底层资源使出“引用计数法”方法三:复制底部资源方法四:转移底部资源的拥有权 2、总结3、参考 1、Terms14:Think carefully about copying behavior i
问题1 int main(){unsigned char a = 200;unsigned char b = 100;unsigned char c = 0;c = a + b;printf(“%d %d”, a+b,c);return 0;} 问题是求这个程序的执行结果; 200,100,都是整形,左边的表达式都是char类型,会发生转换,整形占4个字节,而char占一个字节,200是