A wave of C-language character array practical skills collection _c language

Character array Reverse

#include <stdio.h> 

 void Daoxu (char str[]) { 
   int i; 
   char temp; 
   for (i = 0; i < strlen (str)/2; i + +) { 
     temp = str[i]; 
     Str[i] = Str[strlen (str)-i-1]; 
     Str[strlen (str)-i-1] = temp; 
   } 
  

Word Count

 int WordCount (char str[]) { 
   int i; 
   int count = 0; 
   int word = 0; 
   for (i = 0; str[i]!= '; i + + 
     } {if (str[i] = = ') 
     { 
       word = 0; 
     } else if (Word = = 0) 
     { 
       word = 1; 
       Count + +; 
     } 
   } 
   return count; 
 } 

Character uppercase to lowercase

 void Mylwr (char str[]) { 
   int i; 
   for (i = 0; Str[i]!= ' and i + +] 
   { 
     if (Str[i] >= ' A ' && str[i] <= ' Z ') 
     { 
       Str[i] + = ' a '- ' A '; 
     } 
   } 
 

Character Lowercase to uppercase

 void Myupr (char str[]) { 
   int i; 
   for (i = 0; Str[i]!= ' and i + + 
   } { 
     if (Str[i] >= ' A ' && str[i] <= ' z ') 
     { 
       Str[i] = ' A '-' A ';}} 
  

Character array evaluates string length

 int Mylen (char str[]) { 
   int len; 
   for (len = 0; Str[len]!= ' "; len + +); 
   return len; 
 } 

string concatenation

 void Mycat (char Str1[],char str2[]) { 
   int i,j; 
   for (i = 0; str1[i]!= '; i++ 
   '; for (j = 0; Str2[j]!= '; j + +] 
   { 
     str1[i + j] = Str2[j]; 
   } 
   Str1[i + j] = ' I '; 
 } 

Specify length string

void Myncat (char str1[],char str2[], int len) { 
   int i,j; 
   for (i = 0; str1[i]!= '; i++ 
   '; for (j = 0; J < Len; j +) 
   { 
     str1[i + j] = Str2[j]; 
   } 
   Str1[i + j] = ' I '; 
 } 

Character array copy

 void mycpy (char Dst[],char src[]) { 
   int i = 0; 
   Do  
   { 
     dst[i] = Src[i], while 
   (src[i++]!= ' "); 
 } 

Character array Specify length copy

 void myncpy (char dst[],char src[], int len) { 
   int i; 
   for (i = 0; i < len; i++) 
   { 
     Dst[i] = Src[i]; 
   } 
   Dst[i] = ' I '; 
 } 

Find the longest word in the sentence

 void Longest (char Dst[],char src[]) { 
   int i = 0,j; 
   int count =0; 
   int max =-1; 
   Do  
   { 
     if (src[i] = = ' | | src[i] = = ' = ' 
     { 
       if (Count > Max) 
       { 
         max = count; 
         for (j = 0; J < Count; J +) 
         { 
           Dst[j] = Src[i-count + j]; 
         } 
         DST[J] = ' I '; 
       } 
       Count = 0; 
     } else{ 
       count++ 
     } 
   } while (src[i++]!= ' a '); 
 } 

To extract an orthopedic number from a string

#include <stdio.h> 
 
int getint (char str[], int a[]) {//Extract the number from the string and place it in the array 
  int i = 0; 
  int w = 0; 
  int c = 0; 
  Int J, K; 
  Do  
  { 
    if (Str[i] > ' 0 ' && str[i] <= ' 9 ') 
    { 
      w++; 
    } else if (W) 
    { 
      j = 0; 
      for (k = w; k > 0; k--) 
      { 
        J *=; 
        J + + Str[i-k]-' 0 '; 
      } 
      w = 0; 
      A[c] = j; 
      C + +; 
    } 
  } while (str[i++] "!="); 
  return c; 
} 
 
void Main () { 
  char str[100]; 
  int a[100]; 
  int I, J; 
  Gets (str); 
  i = Getint (str,a); 
  for (j = 0; J < i; j +) 
  { 
    printf ("%d", a[j]); 
  } 
 

Shaping, character-array conversions

#include <stdio.h> 
#include <stdlib.h> 
 
int sumof1 (int x)//Find the number of 1 after converting to binary 
{ 
  int countx = 0; 
  while (x) 
  { 
    countx + +; 
    x &= x-1; Each with a x-1, you can erase the last 1} return 
  countx; 
 
void Main () { 
 
  char c[10]; 
  int i = 999; 
 
  Itoa (i, C, 10);//Convert to a character array 
  puts (c) in 10; 
 
  Itoa (i, C, 16);//Convert to an array of characters in 16 
  ; printf ("0x%s\n", c); 
 
  Itoa (i, C, 8);//Convert to an array of characters in 8 
  ; printf ("0%s\n", c); 
 
  Itoa (i, C, 2);//Convert to a character array 
  puts (c) in 2; 
 
  i = Atoi (c);//Then turn the string into an orthopedic 
  printf ("%d\n", I); 
 
  printf ("%d\n", Sumof1 (i));//1 number in 2