%zu是C语言中size_t类型格式化占位符例如sizeof函数返回的是size_t类型下面用printf语句打印#includestdio.hintmain(){longlonga20;unsignedlonglongc-23;printf(size of a: %zu\n,sizeof(a));printf(size of c: %zu\n,sizeof(c));}运行输出