第1题
#include<stdio.h>
void readChar(char* words , int len);
int main(void)
{
int LEN;
printf("Please Input The Max Lenght:\n");
scanf("%d",&LEN);
getchar();
char Letters[LEN];
readChar(Letters,LEN);
for(int i = 0 ; i < LEN ; ++i)
printf("%c ",*(Letters+i));
return 0;
}
void readChar(char* words , int len)
{
printf("Please Input %d Chars.",len);
fgets(words,len+1,stdin);
}
第3题
#include<stdio.h>
const char stop_1 = ' ';
const char stop_2 = '\t';
const char stop_3 = '\n';
const int LEN = 100;
int getWord(char* words , int Len , char* firstWord);
int main(void)
{
char getWords[LEN];
char FWord[LEN];
printf("Please Input:\n");
fgets(getWords,LEN,stdin);
int realLen = getWord(getWords,LEN,FWord);
printf("First Word Is :");
for(int i = 0 ; i < realLen ; ++i)
printf("%c",*(FWord+i));
return 0;
}
int getWord(char* words , int Len , char* firstWord)
{
char mid;
int i = 0;
for( ; i < Len ; ++i) // *-*
{
mid = *(words+i);
if(mid == stop_1 || mid == stop_2 || mid == stop_3)
{
*(firstWord+i) = '\0';
break;
}
else
*(firstWord+i) = mid;
}
return i;
}
第4题
#include<stdio.h>
const int MLen = 100;
const char unKnowChar = '\0';
const char* findChar(const char* sourceWord , int Len ,char targetChar);
int main(void)
{
const char tarChar = 'a'; // the target char is 'a'
char TestWord[MLen];
printf("Please Input Any Words:");
fgets(TestWord,MLen,stdin);
const char* FChar = findChar(TestWord,MLen,tarChar);
if(FChar == &unKnowChar)
{
printf("We Can't Find 'a' on This Word.");
return 0;
}
for(int i = 0 ; i < MLen ; ++i)
{
if(FChar == (TestWord+i))
printf("We Find Letter That's 'a' On %dth.",i+1);
}
return 0;
}
const char* findChar(const char* sourceWord , int Len ,char targetChar)
{
for(int i = 0 ; i < Len ; ++i)
{
if(*(sourceWord+i) == targetChar)
return sourceWord+i;
}
return &unKnowChar;
}
第5题
#include<stdio.h>
#include<stdbool.h>
const char MLen = 100;
bool findChar(const char* source , char tarChar);
int main(void)
{
const char tarChar = 'a';
char words[MLen];
printf("Please Input Ant Words:");
fgets(words,MLen,stdin);
bool result = findChar(words,tarChar);
if(result == true)
printf("We Find THe Char On This Word.\n");
else
printf("We Can't Find.\n");
return 0;
}
bool findChar(const char* source , char tarChar)
{
for(int i = 0 ; ; ++i)
{
if(*(source+i) == tarChar)
return true;
if(*(source+i) == '\0')
break;
}
return false;
}
第6题
#include<stdio.h>
const int MLen = 100;
const int copyLen = 10;
char* myCopy(char* tar , const char* source , int Len);
int main(void)
{
char cinWord[MLen];
char tarWord[copyLen];
printf("Please Intpu Any Words:");
fgets(cinWord,MLen,stdin);
myCopy(tarWord,cinWord,copyLen);
for(int i = 0 ; i < copyLen ; ++i)
{
if(*(tarWord+i) == '\0')
printf("*");
printf("%c",*(tarWord+i));
}
return 0;
}
char* myCopy(char* tar , const char* source , int Len)
{
for(int i = 0 ; i < Len ; ++i)
*(tar+i) = *(source+i);
return tar;
}
第7题
#include<stdio.h>
#include<stdbool.h>
const int MLen = 100;
const char None = '\0';
const char* string_in(const char* source , const char* tar);
int main(void)
{
const char tarChar[3] = {'a','t'};
char cinWord[MLen];
printf("Please Input Any Words To Test:");
fgets(cinWord,MLen,stdin);
const char* findChar = string_in(cinWord,tarChar);
if(findChar == &None)
{
printf("This Word Don't Include Words \"at\".");
return 0;
}
int index;
for(int i = 0 ; i < MLen ; ++i)
{
if(findChar == cinWord+i)
{
index = i;
break;
}
}
printf("The TargetWord begin %dth Letters.\n",index+1);
return 0;
}
const char* string_in(const char* source , const char* tar)
{
char FChar = *tar;
int beginIndex = 0;
bool result = true;
for(int i = 0 ; ; ++i) //find first char
{
if(*(source+i) == '\0')
break;
if(*(source+i) == FChar)
beginIndex = i;
}
if(beginIndex == 0) //Don't Find Word
result = false;
for(int i = 0 ; *(tar+i) != '\0' ; ++i)
{
if((*(source+beginIndex+i)) != (*(tar+i)))
{
result = false;
break;
}
}
if(result == true)
return source+beginIndex;
else
return &None;
}
第8题
#include<stdio.h>
#include<string.h>
const int MLen = 100;
void turnChar(char* word , int Len);
int main(void)
{
char cinWord[MLen];
printf("PLease Input Any Word To Test:");
fgets(cinWord,MLen,stdin);
int realLen = strlen(cinWord);
turnChar(cinWord,realLen);
for(int i = 0 ; i < realLen ; ++i)
printf("%c",*(cinWord+i));
return 0;
}
void turnChar(char* word , int Len)
{
char mid[Len];
strncpy(mid,word,Len);
int j = Len-1;
for(int i = 0; i < Len ; ++i,--j)
strcpy(word+i,mid+j);
}
第9题
#include<stdio.h>
#include<string.h>
const int MLen = 100;
void popSpace(char* source , int Len);
int main(void)
{
char words[MLen];
printf("Please Input Any Words To Test:");
fgets(words,MLen,stdin);
popSpace(words,MLen);
fputs(words,stdout);
return 0;
}
void popSpace(char* source , int Len)
{
char mid[Len];
strcpy(mid,source);
for(int i = 0 , j = 0; i < Len ; ++i)
{
if(*(mid+i) == ' ')
continue;
else
{
strcpy(source+j,mid+i);
++j;
}
}
}
第10题
#include<stdio.h>
#include<string.h>
#include<stdbool.h>
const int MLen = 100;
const int EleLen = 10;
void putASCII(char (*word)[MLen] , int n);
void putSource(char (*word)[MLen] , int n);
void putLenght(char (*word)[MLen] , int n);
void putFirstWord(char (*word)[MLen] , int n);
int LenForFirstWord(char* word , int n); // Lenght For First Words
int main(void)
{
char TestWord[EleLen][MLen];
int realLen = 0;
for(int i = 0 ; i < EleLen ; ++i)
{
printf("PLease INput %dth Words:",i+1);
fgets(*(TestWord+i),MLen,stdin);
++realLen;
}
bool on_off = true;
while(on_off)
{
printf("A:ouput B:by ASCII C: by Lenght\n");
printf("D:by Lenght Of First Word Q:quit\n");
char ch;
scanf("%c",&ch);
getchar();
switch(ch)
{
case 'A':putSource(TestWord,realLen);
break;
case 'B':putASCII(TestWord,realLen);
break;
case 'C':putLenght(TestWord,realLen);
break;
case 'D':putFirstWord(TestWord,realLen);
break;
case 'Q':on_off = false;
break;
default:on_off = false;
break;
}
}
printf("Done!n");
return 0;
}
void putASCII(char (*word)[MLen] , int n)
{
for(int i = 0 ; i < n ; ++i)
{
for(int j = 0 ; j < MLen ; ++j)
{
char ch = *(*(word+i)+j);
if(ch == '\0')
break;
printf("%d ",ch);
}
printf("\n");
}
}
void putSource(char (*word)[MLen] , int n)
{
for(int i = 0 ; i < n ; ++i)
fputs(*(word+i),stdout);
}
void putLenght(char (*word)[MLen] , int n)
{
char mid[n][MLen];
for(int i = 0 ; i < n ; ++i)
strcpy(*(mid+i),*(word+i));
for(int i = 0 ; i < n ; ++i) //sort by lenght
{
for(int j = i ; j < n ; ++j)
{
char midChar[MLen];
if(strlen(*(mid+i)) > strlen(*(mid+j)))
{
strcpy(midChar,*(mid+i));
strcpy(*(mid+i),*(mid+j));
strcpy(*(mid+j),midChar);
}
}
}
for(int i = 0 ; i < n ; ++i)
fputs(*(mid+i),stdout);
}
void putFirstWord(char (*word)[MLen] , int n)
{
char mid[n][MLen];
for(int i = 0 ; i < n ; ++i)
{
printf("%d\n",LenForFirstWord(*(word+i),MLen));
printf("%d\n",LenForFirstWord(*(mid+i),MLen));
strcpy(*(mid+i),*(word+i));
}
for(int i = 0 ; i < n ; ++i) //sort by lenght
{
for(int j = i ; j < n ; ++j)
{
char midChar[MLen];
if(LenForFirstWord(*(mid+i),MLen) > LenForFirstWord(*(mid+j),MLen))
{
strcpy(midChar,*(mid+i));
strcpy(*(mid+i),*(mid+j));
strcpy(*(mid+j),midChar);
}
}
}
for(int i = 0 ; i < n ; ++i)
fputs(*(mid+i),stdout);
}
int LenForFirstWord(char* word , int n)
{
int Lenght = 0;
for(int i = 0 ; i < n ; ++i)
{
if((*(word+i)) == ' ')
{
Lenght = i;
break;
}
}
return Lenght;
}
第11题
#include<stdio.h>
#include<ctype.h>
const int MaxLen = 100;
int main(void)
{
char Word[MaxLen];
printf("Please Inupt Any Words To Test:\n");
int Counts = 0;
while(Counts < MaxLen-1) //input
{
char ch = getchar();
if(ch != EOF)
{
Word[Counts] = ch;
++Counts;
}
if(ch == EOF)
break;
}
Word[Counts] = '\0';
int Letters = 0;
int upLetters = 0;
int lowLetters = 0;
int punct = 0;
int digit = 0;
for(int i = 0 ; i < Counts ; ++i)
{
if(isalpha(Word[i]))
++Letters;
if(isupper(Word[i]))
++upLetters;
if(islower(Word[i]))
++lowLetters;
if(ispunct(Word[i]))
++punct;
if(isdigit(Word[i]))
++digit;
}
printf("\nWe Get %d Letters,%d Upper,%d Lower,%d Punct,%d Digit.\n",Letters,upLetters,lowLetters,punct,digit);
return 0;
}
第12题
#include<stdio.h>
int main(int argc , char* argv[])
{
if(argc == 1)
{
printf("Bye!\n");
return 0;
}
for(int i = argc-1 ; i > 0 ; --i)
{
fputs(*(argv+i),stdout);
printf(" ");
}
return 0;
}
第13题
#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#include<math.h>
int myAtoi(char* v);
int main(int argc , char* argv[])
{
if(argc != 3)
{
printf("Wrong Element!\n");
printf("Done!\n");
return 0;
}
double D = atof(argv[1]);
int E = myAtoi(argv[2]);
double Pows = 1;
for(int i = 0 ; i < E ; ++i)
Pows *= D;
printf("%.2lf\n",Pows);
printf("Done!\n");
return 0;
}
int myAtoi(char* v)
{
int Index;
for(int i = 0 ; ; ++i)
{
if(!isdigit(v[i]))
{
Index = i;
break;
}
}
int Value = 0;
for(int i = Index-1,j=0 ; i >= 0 ; --i,++j)
{
int mid = v[i];
Value += (mid-48)*pow(10,j);
}
printf("%d\n",Value);
return Value;
}
第14题
#include<stdio.h>
#include<string.h>
#include<ctype.h>
#include<math.h>
int main(int argc , char** argv)
{
if(argc != 2)
{
printf("Wrong Element.");
return 0;
}
int Len = 0;
int allLen = strlen(*(argv+1));
for(int i = 0 ; i < allLen ; ++i)
{
if(((*(argv+1))[i]) > 47 && (*(argv+1))[i] < 59)
Len += 1;
}
int Res = 0;
for(int i = 0 ; i < Len ; ++i)
Res += ((*(argv+1))[i] - 48)* pow(10,Len-1-i); //on ASCII, char '0' = 48(int)
printf("%d",Res);
return 0;
}
第15题
#include<stdio.h>
#include<string.h>
#include<ctype.h>
const int MaxLen = 100;
const char choose_1[3] = "-p\0";
const char choose_2[3] = "-u\0";
const char choose_3[3] = "-l\0";
int main(int argc , char* argv[])
{
if(argc != 2)
{
printf("Wrong Element!\n");
printf("Done!\n");
return 0;
}
char words[MaxLen];
int Counts = 0;
printf("Please Inupt Any Words To Test:\n");
while(Counts < MaxLen-1)
{
char ch = getchar();
if(ch != EOF)
{
words[Counts] = ch;
++Counts;
}
if(ch == EOF)
break;
}
words[Counts] = '\0';
printf("\n");
if(strncmp(*(argv+1),choose_1,2) == 0)
{
fputs(words,stdout);
return 0;
}
if(strncmp(*(argv+1),choose_2,2) == 0)
{
for(int i = 0 ; i <= Counts ; ++i)
{
if(islower(words[i]))
words[i] = toupper(words[i]);
}
fputs(words,stdout);
return 0;
}
if(strncmp(argv[1],choose_3,2) == 0)
{
for(int i = 0 ; i <= Counts ; ++i)
{
if(isupper(words[i]))
words[i] = tolower(words[i]);
}
fputs(words,stdout);
return 0;
}
}
