String Programs

#include <stdio.h>
int main(){
    char name[20];
    printf("Enter name: ");
    scanf("%s",name);
    printf("Your name is %s.",name);
    return 0;
}



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#include <stdio.h>
int main()
{
    char name[30];
    printf("Enter name: ");
    gets(name);     //Function to read string from user.
    printf("Name: ");
    puts(name);    //Function to display string.
    //return 0;
}


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#include <stdio.h>
#include <string.h>

int main ()
{

   char str1[12] = "Hello";
   char str2[12] = "World";
   char str3[12];
   int  len ;

   /* copy str1 into str3 */
   strcpy(str3, str1);
   printf("strcpy( str3, str1) :  %s\n", str3 );

   /* concatenates str1 and str2 */
   strcat( str1, str2);
   printf("strcat( str1, str2):   %s\n", str1 );

   /* total lenghth of str1 after concatenation */
   len = strlen(str1);
   printf("strlen(str1) :  %d\n", len );

   return 0;
}


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Passing Strings to Functions

 

#include <stdio.h>
void Display(char ch[]);
int main(){
    char c[50];
    printf("Enter string: ");
    gets(c);             
    Display(c);     // Passing string c to function.    
    return 0;
}
void Display(char ch[]){
    printf("String Output: ");
    puts(ch);
}

String Manipulations In C Programming Using Library Functions

Function	Work of Function
strlen()	Calculates the length of string
strcpy()	Copies a string to another string
strcat()	Concatenates(joins) two strings
strcmp()	Compares two string
strlwr()	Converts string to lowercase
strupr()	Converts string to uppercase

 

 C Program to Find the Frequency of Characters in a String

#include <stdio.h>
int main(){
   char c[1000],ch;
   int i,count=0;
   printf("Enter a string: ");
   gets(c);
   printf("Enter a character to find frequency: ");
   scanf("%c",&ch);
   for(i=0;c[i]!='\0';++i)
   {
       if(ch==c[i])
           ++count;
   }
   printf("Frequency of %c = %d", ch, count);
   return 0;
}

C Program to Find the Number of Vowels, Consonants, Digits and White space in a String 

#include<stdio.h>
int main(){
    char line[150];
    int i,v,c,ch,d,s,o;
    o=v=c=ch=d=s=0;
    printf("Enter a line of string:\n");
    gets(line);
    for(i=0;line[i]!='\0';++i)
    {
        if(line[i]=='a' || line[i]=='e' || line[i]=='i' || line[i]=='o' || line[i]=='u' || line[i]=='A' || line[i]=='E' || line[i]=='I' || line[i]=='O' || line[i]=='U')
            ++v;
        else if((line[i]>='a'&& line[i]<='z') || (line[i]>='A'&& line[i]<='Z'))
            ++c;
        else if(line[i]>='0'&&c<='9')
            ++d;
        else if (line[i]==' ')
            ++s;
    }
    printf("Vowels: %d",v);
    printf("\nConsonants: %d",c);
    printf("\nDigits: %d",d);
    printf("\nWhite spaces: %d",s);
    return 0;
}