2020-04-14长光工程师学习日记

今天继续学习了指针的内容

指针的难度教之前学习的内容难度有所上升，今天主要的内容就是对指针问题的继续学习与复习。

作业一

#include

#include

int main()

{

//char *p[5];

char ss[10]={"\0"};

char s[5][10]={"ertt","dwnns","ej","nenwbrt","abc"};

int i,j;

for(j=0;j<4;j++)

{

for(i=0;i<4;i++)

{

if(strlen(s[i])>strlen(s[i+1]))

{

strcpy(ss,s[i]);

strcpy(s[i],s[i+1]);

strcpy(s[i+1],ss);

}

}

}

strcpy(ss,"\0");

for(i=0;i<5;i++)

{

if((*(s[i]+2))!='\0')

{

ss[i]=*(s[i]+2);

}

else

{

ss[i]=' ';

}

}

puts(ss);

for(i=0;i<5;i++)

{

puts(s[i]);

}

}

作业二

#include

int replace(char *p);

int main()

{

int b;

char s[20]={"\0"};

gets(s);

b=replace(s);

puts(s);

printf("替换的字符个数为：%d\n",b);

}

int replace(char *p)

{

int i;

int m=0;

for(i=0;i<20;i++)

{

if(*(p+i)=='t')

{

*(p+i)='e';

m++;

}

if(*(p+i)=='T')

{

*(p+i)='E';

m++;

}

}

return m;

}

作业三

#include

int main()

{

int a;

char s[7][20]={

"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"

};

char *p[7];

int i;

for(i=0;i<7;i++)

{

p[i]=s[i];

}

while(scanf("%d",&a)&&a<8&&a>0)

{

puts(p[a-1]);

}

}

课上练习题

#include

#include

int* fun(int *p,int len,int f);

int main()

{

int s[100]={0};

int i=0;

while(scanf("%d",&s[i])&&s[i]!=0)

{

i++;

}

printf("奇数和为：%d\n",*fun(s,i,1));

printf("偶数和为：%d\n",*fun(s,i,0));

}

int* fun(int *p,int len,int f)

{

int sum1=0,sum2=0;

int *add,*even;

int i;

if(f==1)

{

for(i=0;i

{

if((*(p+i))%2==1)

{

sum1+=(*(p+i));

}

}

add=&sum1;

return add;

}

if(f==0)

{

for(i=0;i

{

if((*(p+i))%2==0)

{

sum2+=(*(p+i));

}

}

even=&sum2;

return even;

}

}