#include<stdio.h>
int main()
{
    int n;
    int count = 1;
    printf("please input a number;");
    scanf("%d", &n);
    do(
        if (n % 2)
            (
                n = n * 3 + 1;
                printf("(%d):%d\n", count++, n);
            )
        else
        (
            n /= 2;
            printf("(%d):%d\n", count++, n);
            )
            )while (n != 1);
            return 0;
}


严重性    代码    说明    项目    文件    行    禁止显示状态
错误(活动)        应输入表达式    ConsoleApplication2    c:\Users\Administrator\Documents\Visual Studio 2015\Projects\ConsoleApplication2\ConsoleApplication2\源.c    10   
错误(活动)        应输入“;”    ConsoleApplication2    c:\Users\Administrator\Documents\Visual Studio 2015\Projects\ConsoleApplication2\ConsoleApplication2\源.c    20   
错误    C2059    语法错误:“if”    ConsoleApplication2    c:\users\administrator\documents\visual studio 2015\projects\consoleapplication2\consoleapplication2\源.c    10   
错误    C2059    语法错误:“)”    ConsoleApplication2    c:\users\administrator\documents\visual studio 2015\projects\consoleapplication2\consoleapplication2\源.c    20   
错误    C2061    语法错误: 标识符“printf”    ConsoleApplication2    c:\users\administrator\documents\visual studio 2015\projects\consoleapplication2\consoleapplication2\源.c    13   
错误    C2143    语法错误: 缺少“;”(在“)”的前面)    ConsoleApplication2    c:\users\administrator\documents\visual studio 2015\projects\consoleapplication2\consoleapplication2\源.c    14   
错误    C2143    语法错误: 缺少“;”(在“)”的前面)    ConsoleApplication2    c:\users\administrator\documents\visual studio 2015\projects\consoleapplication2\consoleapplication2\源.c    19   

do{
大括号

谢谢大佬的好心帮助,刚刚试了一下完美解决.