#include <stdio.h>#include <string.h>void main(){/*//哪一种格式不合理int a, b;double c;//scanf("%d,%x,%f", &a, &b, &c);//ok//printf("%d, %x, %f", a, b, c);//scanf("%d,%d,%e", &a, &b, &c);//ok//printf("%d, %d, %e", a, b, c);scanf("%o,%x,%o", &a, &b, &c);//％o以八进制数形式处理整数printf("%o, %x, %o", a, b, c);//scanf("%d,%o,%e", &a, &b, &c);//ok//printf("%d, %o, %e", a, b, c);*//*//字符串数组后期赋值方法char s[10];//s = "abcd";//error C2106: '=' : left operand must be l-valuestrcpy(s, "abcd");printf("%s strlen(s) = %d\n", s, strlen(s));//abcd strlen(s) = 4*//*int c[3][4];c[1][4] = 4;*//*//求结果//input 5int x;scanf("%d", &x);if(x++>5)printf("%d\n", x);elseprintf("%d\n", --x);//5*//*//求结果char str[] = "\n\t\\\0ab";int len;len = sizeof(str);//7len = strlen(str);//3;*//*//多种参数格式化输入int a;char b;char c[3];printf("input [int]a [char]b [char*]c\n");scanf("%d %c %s", &a, &b, c);printf("int a = %d char b = %c char c[3] = %s\n", a, b, c);*//*//数组循环赋值int num = 0;int columns[3];while((num < 3) && (scanf("%d", &columns[num]) == 1)){printf("columns[%d] = %d\n", num, columns[num]);num++;}printf("num = %d columns[%d] = %d", num, num, columns[num]);*//*//哪一个字符串赋值正确的,定义的时候赋值都正确//char str[5] = "abcd";//ok//char str[] = "abcd";//ok//char *str = "abcd";//ok//char str[5] = {'a', 'b', 'c', 'd'};//ok//printf("%s\n", str);//先定义后赋值就不对了char String[5];String = "abcd";//error C2106: '=' : left operand must be l-value//strcpy(String, "abcd");//okprintf("%s\n", String);*//*//两个数值交换int a = 10;int b = 5;printf("Before change:\ta = %d, b = %d\n", a, b);//加减法//a = a + b;//b = a - b;//a = a - b;//异或法(推荐)a = a ^ b;b = a ^ b;a = a ^ b;printf("After change:\ta = %d, b = %d\n", a, b);*//*int nBit;//第二位置位int a = 3;//011a |= 1<<2;//111printf("%d\n", a);//第二位清位a &= ~(1<<2);//011printf("%d\n", a);//获取第二位nBit = (a>>2) & 0x01;//0printf("%d\n", nBit);*//*//[24] [180] [42] [other]int a[3][4] = {1,3,5,7, 9,11,13,15, 17,19,21,23};int (*p)[4] = a;int i, j, k=0;for(i=0; i<2; i++)for(j=0; j<2;j++)k = k+ *(*(p+i) + j);printf("%d\n", k);//24*/}
