安装
下载离线安装包iso文件，加载之后选择安卓，如果要写c/c++记得勾选widows sdk .
VS控制台程序运行一闪而过的完美解决办法
在你的项目条目（project）上右击鼠标，在弹出菜单上选择最后一项“property/属性”，在左边的一栏里找到“配置属性->链接器->系统”，点击“系统”项后，在右边的栏的“子系统（subSystem）”将刻项的值配置为”Console(/SUBSYSTEM:CONSOLE)”。
调试时不再用F5键，改成Ctrl+F5键。
hello world
#include <stdio.h>int main(){ printf("help"); return 0;}数据类型
位： 最小存储单位bit ，可容纳 0 和 1 。字节： byte常用存储单位。一般来说，1byte=8bit，可表示0~255整数或字符。字： word自然存储单位。现使用64位系统，即1字为64位。
#include <stdio.h>#include <inttypes.h>int main(){ // 整数类型 int i = 1024; printf("I am %d years old \n" , i); printf("sizeof int is %d \n", sizeof(i)); printf("i dec = %d; octal = %o ; hex = %x \n", i, i, i); printf("i dec = %d; octal = %#o ; hex = %#x \n", i, i, i); printf("sizeof short int is %d \n", sizeof(short int)); short si = 1024; printf("print short use %%hd eg %hd \n" , si); printf("sizeof long int is %d \n", sizeof(long int)); printf("sizeof long long int is %d \n", sizeof(long long int)); long long lli = 1024; printf("pring long long use %%lld eg %lld \n", lli); printf("sizeof unsigned int is %d \n", sizeof(unsigned int)); printf("sizeof unsigned long int is %d \n", sizeof(unsigned long int)); // char 类型 char c = 'A'; printf("size of char is %u \n", sizeof(char)); printf("printf char use %%c eg %c or %%d eg %d \n", c, c); unsigned char uc = 255; printf("char uc is %c ,int uc is %d \n", uc, uc); // _Bool 类型 0:flase other:true _Bool flag = 2; printf("size of _Bool is %d \n", sizeof(_Bool)); printf("printf _Bool eg %d \n", flag); // 可移植类型 inttypes.h int16_t me16 = 4593; printf("me16 = %hd \n", me16); printf("me16 = %"PRId16"\n", me16); // float / double / long double 类型 float ff = 10e9; double dd = 10e9; long double ld = 10e9; printf("size of float is %d \n", sizeof(float)); printf("size of double is %d \n", sizeof(double)); printf("size of long double is %d \n" , sizeof(long double)); printf("%f can ber written %e\n", ff, ff); printf("%f can ber written %e\n", dd, dd); printf("%f can ber written %e\n", ld, ld); return 0;}字符串输入输出
关于使用VS会出现scanf要用scanf_s的处理：Alt+F7，打开工程属性，c/c++ 预处理器定义，添加一行内容_CRT_SECURE_NO_DEPRECATE就OK了
#include <stdio.h>#define HI "ni hao a ! "int main(){ // 字符串输入输出 char name[40]; printf("What's your name ?\n"); scanf("%s", name); printf("%s , %s \n", HI, name); return 0;}格式化输出
#include <stdio.h>#include <string.h>int main(){ // 字符串函数 char name[40] = "qianqian.sun"; printf("size of name is %u \n", sizeof(name)); // 40 printf("length of name is %d \n ", strlen(name)); // 12 printf("\n使用修饰符 和 转换符打印表格\n"); for (int i = 0; i < 25; i++)printf("-"); printf("\n"); printf("| %5s | %5s | %5s | \n", "姓名", "年龄", "身高"); for (int i = 0; i < 25; i++)printf("-"); printf("\n"); printf("| %5s | %5d | %5.2f | \n","前前",24,1.85); for (int i = 0; i < 25; i++)printf("-"); printf("\n"); // * 修饰符 printf("可指定宽度和精度:%*d\n", 5, 100); printf("可指定宽度和精度:%*.*f\n", 10,2, 10.0); int width, precision; scanf("%*d %d %d", &width, &precision); // 跳過第一个参数 printf(" Value = %*.*f \n", width, precision, 66.6); return 0;}字符的输入输出
字符与单词统计
#include <stdio.h>#include <stdlib.h>#include <ctype.h>int main(){ int ch; FILE * fp; char name[50] = "C:/share/PostLoanData/file.txt"; fp = fopen(name, "r"); if (NULL == fp) { printf("Fail to open file \n"); exit(1); } int count, lower_count, upper_count, word_len, word_count,cur_word; count = lower_count = upper_count = word_len = word_count = cur_word =0; while ((ch = getc(fp)) != EOF) { switch (ch) { case '\n': printf("\\n"); break; case '\t': printf("\\t"); break; default: putchar(ch); break; } printf(": %d |", ch); if (++count % 10 == 0)printf("\n"); if (islower(ch)) lower_count++; if (isupper(ch)) upper_count++; if (isalpha(ch)) cur_word++; // 字母则累计 if (isdigit(ch)) cur_word = 0; //遇到 数字 则清零 if ((isspace(ch) || ispunct(ch)) && cur_word>0) { word_count++; word_len += cur_word; cur_word = 0; //空白 标点则判断当前是否为单词 } } if (cur_word>0) { word_count++; word_len += cur_word; } fclose(fp); printf("\n 字符总数: %5d \n", count); printf("大写字母数: %d , 小写字母数: %d \n", upper_count, lower_count); printf("大写字母数: %d , 小写字母数: %d \n", upper_count, lower_count); printf("word_len = %d \n", word_len); printf("单词总数: %d , 平均长度: %5.2f \n", word_count, (double)word_len/ word_count); return 0;}为什么？答：点线杆上贴着”“此处不许小便！”
