Important program related with string (For English and Hindi both)

Important C Programs on String Manipulation 

 

1. String Selection Sort

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

int main() {
    char data[10][50];
    char temp[50];
    int x, y, m;

    printf("Enter 10 strings:\n");
    for(x = 0; x < 10; x++)
        gets(data[x]);

    for(x = 0; x < 9; x++) {
        m = x;
        for(y = x + 1; y < 10; y++) {
            if(strcmp(data[y], data[m]) < 0)
                m = y;
        }
        if(m != x) {
            strcpy(temp, data[x]);
            strcpy(data[x], data[m]);
            strcpy(data[m], temp);
        }
    }

    printf("\nStrings after Selection Sort:\n");
    for(x = 0; x < 10; x++)
        printf("%s\n", data[x]);

    return 0;
}

---

 2. String Bubble Sort

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

int main() {
    char data[10][50], temp[50];
    int x, y;

    printf("Enter 10 strings:\n");
    for(x = 0; x < 10; x++)
        gets(data[x]);

    for(x = 0; x < 9; x++) {
        for(y = 0; y < 9 - x; y++) {
            if(strcmp(data[y], data[y + 1]) > 0) {
                strcpy(temp, data[y]);
                strcpy(data[y], data[y + 1]);
                strcpy(data[y + 1], temp);
            }
        }
    }

    printf("\nStrings after Bubble Sort:\n");
    for(x = 0; x < 10; x++)
        printf("%s\n", data[x]);

    return 0;
}

---

 3. Sequential Search

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

int main() {
    char data[10][50], key[50];
    int x, found = 0;

    printf("Enter 10 strings:\n");
    for(x = 0; x < 10; x++)
        gets(data[x]);

    printf("Enter string to search: ");
    gets(key);

    for(x = 0; x < 10; x++) {
        if(strcmp(data[x], key) == 0) {
            printf("String found at position %d\n", x + 1);
            found = 1;
            break;
        }
    }

    if(!found)
        printf("String not found.\n");

    return 0;
}

---

 4. Binary Search

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

int main() {
    char data[10][50], key[50], temp[50];
    int x, y, low, high, mid, found = 0;

    printf("Enter 10 strings:\n");
    for(x = 0; x < 10; x++)
        gets(data[x]);

    // Sort first (Bubble Sort)
    for(x = 0; x < 9; x++) {
        for(y = 0; y < 9 - x; y++) {
            if(strcmp(data[y], data[y + 1]) > 0) {
                strcpy(temp, data[y]);
                strcpy(data[y], data[y + 1]);
                strcpy(data[y + 1], temp);
            }
        }
    }

    printf("Enter string to search: ");
    gets(key);

    low = 0;
    high = 9;

    while(low <= high) {
        mid = (low + high) / 2;
        if(strcmp(data[mid], key) == 0) {
            printf("String found at position %d\n", mid + 1);
            found = 1;
            break;
        } else if(strcmp(data[mid], key) > 0)
            high = mid - 1;
        else
            low = mid + 1;
    }

    if(!found)
        printf("String not found.\n");

    return 0;
}

---

 5. Find Length of a String (strlen Function)

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

int main() {
    char str[100];
    int len;

    printf("Enter a string: ");
    gets(str);

    len = strlen(str);

    printf("Length of string = %d\n", len);
    return 0;
}

---

 6. Copy One String to Another (strcpy Function)

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

int main() {
    char str1[100], str2[100];

    printf("Enter a string: ");
    gets(str1);

    strcpy(str2, str1);

    printf("Copied string: %s\n", str2);
    return 0;
}

---

 7. Compare Two Strings (strcmp Function)

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

int main() {
    char str1[100], str2[100];

    printf("Enter first string: ");
    gets(str1);
    printf("Enter second string: ");
    gets(str2);

    if(strcmp(str1, str2) == 0)
        printf("Strings are equal.\n");
    else
        printf("Strings are not equal.\n");

    return 0;
}

---

 8. Concatenate Two Strings (strcat Function)

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

int main() {
    char str1[100], str2[100];

    printf("Enter first string: ");
    gets(str1);
    printf("Enter second string: ");
    gets(str2);

    strcat(str1, str2);

    printf("Concatenated string: %s\n", str1);
    return 0;
}

---

9. Reverse a String (strrev Function or Manual Method)

Using strrev() (Turbo C)

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

int main() {
    char str[100];

    printf("Enter a string: ");
    gets(str);

    strrev(str);

    printf("Reversed string: %s\n", str);
    return 0;
}

---

Manual Method (Standard Compilers)

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

int main() {
    char str[100], rev[100];
    int x, len;

    printf("Enter a string: ");
    gets(str);

    len = strlen(str);
    for(x = 0; x < len; x++)
        rev[x] = str[len - x - 1];
    rev[len] = '\0';

    printf("Reversed string: %s\n", rev);
    return 0;
}

---

 10. Count Vowels, Consonants, and Spaces

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

int main() {
    char str[200];
    int x, vowels = 0, consonants = 0, spaces = 0;

    printf("Enter a string: ");
    gets(str);

    for(x = 0; str[x] != '\0'; x++) {
        char ch = tolower(str[x]);
        if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
            vowels++;
        else if(ch == ' ')
            spaces++;
        else if(ch >= 'a' && ch <= 'z')
            consonants++;
    }

    printf("Vowels: %d\nConsonants: %d\nSpaces: %d\n", vowels, consonants, spaces);
    return 0;
}

---

 11. Count Words in a Sentence

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

int main() {
    char str[200];
    int x, count = 1;

    printf("Enter a sentence: ");
    gets(str);

    for(x = 0; str[x] != '\0'; x++) {
        if(str[x] == ' ' && str[x + 1] != ' ' && str[x + 1] != '\0')
            count++;
    }

    printf("Total words: %d\n", count);
    return 0;
}

---

 12. Check if a String is Palindrome

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

int main() {
    char str[100], rev[100];
    int x, len;

    printf("Enter a string: ");
    gets(str);

    len = strlen(str);
    for(x = 0; x < len; x++)
        rev[x] = str[len - x - 1];
    rev[len] = '\0';

    if(strcmp(str, rev) == 0)
        printf("String is Palindrome.\n");
    else
        printf("String is not Palindrome.\n");

    return 0;
}