读书共享 Primer Plus C-part 7

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第十章数组和指针

1.关于二维数组跟指针

#include<stdio.h>int main(){
int arrs [][]={{,,,},{,,,},{,,,}};
int i = ;
for(i=;i< ;i++) {
printf("%d \n",**arrs+i); }}

上述代码：可以说明二维数组的指针的排序以及使用

按行打

#include<stdio.h>int main(){
int arrs [][]={{,,,},{,,,},{,,,}};
int i = ;
for(i=;i< ;i++) {
printf("%d \n",*(arrs[]+i)); }}

按列打

#include<stdio.h>int main(){
int arrs [][]={{,,,},{,,,},{,,,}};
int i = ;
for(i=;i< ;i++) {
printf("%d \n",**arrs+i*); }
}

第十一章字符串和字符串函数

关于字符串的2种表达方式

char heart[]="liuchaunwu";
char * head = "liuchuanwu";
head++; //OK
haart++; //NOK

#include<stdio.h> int main()
{ char name[] ={}; puts("what is your name"); //gets(name);
char heart[] = "liu chuan wu";
char * head = "liu chuan wu"; while(*head!='\0')
{
putchar(*head++);
}
putchar('\n'); while(*heart!='\0')
{
putchar(*heart++);
}
putchar('\n'); }

二维数组的打印

#include<stdio.h>
int main()
{
char *str[]={
"what is your name? \0",
"my name is liuchuanwu.\0",
"do you love me?\0",
"I am so sorry!\0" };
int i =;
for(;i<;i++)
{
printf("%s \n",(str[i])); } }