99. Program to count frequency of characters in a string.

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

void main()
{
char str[1500];
int c = 0, count[26] = {0};
clrscr();

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

while (str[c] != '\0')
{

if (str[c] >= 'a' && str[c] <= 'z')
count[str[c] - 'a']++;
c++;
}

for (c = 0; c < 26; c++)
{
if (count[c] != 0)
printf("%c occurs %d times in the string.\n", c + 'a', count[c]);
}
getch();
}
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100. Program to count total number of uppercase and lowercase in a string.

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

void main()
{
int upper = 0, lower = 0;
char ch[80];
int i;
clrscr();

printf("Enter string : ");
gets(ch);

i = 0;
while (ch[i] != '\0')
{
//uppercase counter
if (ch[i] >= 'A' && ch[i] <= 'Z')
{
upper++;
}

//lowercase counter
if (ch[i] >= 'a' && ch[i] <= 'z')
{
lower++;
}

i++;
}

printf("\nUppercase Letters : %d", upper);
printf("\nLowercase Letters : %d", lower);

getch();
}
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101. Program to calculate the length of string.

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

void main()
{
char a[100];
int length;
clrscr();
printf("\nEnter a string to calculate it's length : ");
gets(a);

length = strlen(a);

printf("\nLength of entered string is : %d", length);

getch();
}
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Update 5

102. Program to calculate the length of string without using strlen() function.

#include<stdio.h>
#include<conio.h>

void main()
{
char s[1000], i;
clrscr();

printf("Enter a string : ");
scanf("%s", s);


for (i = 0; s[i] != '\0'; ++i);

printf("Length of string : %d", i);
getch();
}

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103. Program to check the palindrome of string.

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

void main()
{
char text[100];
int begin, middle, end, length = 0;
clrscr();

printf("Enter the string to check if it is a palindrome : \n");
gets(text);

while (text[length] != '\0')
{
length++;
}
end = length - 1;
middle = length / 2;

for (begin = 0; begin < middle; begin++)
{
if (text[begin] != text[end])
{
printf("\nString is not a palindrome.");
break;
}
end--;
}
if (begin == middle)
printf("\nString is Palindrome.");

getch();
}
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104. Program to check the palindrome of word using array.

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

void main()
{
char word[100];
int length, counter;
clrscr();

printf("Enter a word : ");
scanf("%s", word);
length = strlen(word);
int flag = 1;

for (counter = 0; counter < length / 2 && flag; counter++)
{
if (word[counter] != word[length - counter - 1])
{
flag = 0;
break;
}
}
if (flag)
{
printf("\n%s is a palindrome.", word);
}
else
{
printf("\n%s is NOT a palindrome.", word);
}
getch();
}
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105. Program to remove white space in string.

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

void main()
{
int i = 0, j = 0, len;
char buff[50];
clrscr();

printf("Enter String with white space : ");
gets(buff);

len = (int) strlen(buff);

while (i != len)
{
if (buff[i] != ' ')
buff[j++] = buff[i];
i++;
}
buff[j] = 0;

printf("\nYour String is : %s.", buff);
getch();
}
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106. Program to reverse the string.

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

char *strrev(char *str)
{
char *p1, *p2;

if (!str || !*str)
return str;
for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
{
*p1 ^= *p2;
*p2 ^= *p1;
*p1 ^= *p2;
}
return str;
}

void main()
{
char arr[100];
clrscr();

printf("\nEnter a string to reverse : ");
gets(arr);

strrev(arr);

printf("\nReverse of entered string is : %s", arr);

getch();
}
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107. Program to reverse the string using pointer.

#include<stdio.h>
#include<conio.h>

void main()
{
char str_array[10000], *ptr;
int i, len;
clrscr();

printf("Enter a string : ");
gets(str_array);
ptr = str_array;

for (i = 0; i < 10000; i++)
{
if (*ptr == '\0')
break;
ptr++;
}

len = i;
ptr--;
printf("\nReversed String is : ");
for (i = len; i > 0; i--)
{
printf("%c", *ptr--);
}
getch();
}

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108. Program to sort the strings.

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

void main()
{
int i, j, n;
char str[20][20], temp[20];
clrscr();

printf("Enter the number of string to be sorted : ");
scanf("%d", &n);

for (i = 0; i <= n; i++)
gets(str[i]);

for (i = 0; i <= n; i++)
for (j = i + 1; j <= n; j++)
{
if (strcmp(str[i], str[j]) > 0)
{
strcpy(temp, str[i]);
strcpy(str[i], str[j]);
strcpy(str[j], temp);
}
}

printf("\nSorted string :");
for (i = 0; i <= n; i++)
{
puts(str[i]);
}
getch();
}
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109. Program to swap two strings.

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

void main()
{
char str1[100], str2[100], *temp;
clrscr();

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

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

printf("\nBefore Swapping : \n");
printf("First string : %s\n", str1);
printf("Second string : %s\n", str2);

temp = (char *) malloc(100);

strcpy(temp, str1);
strcpy(str1, str2);
strcpy(str2, temp);

printf("\nAfter Swapping : \n");
printf("First string : %s\n", str1);
printf("Second string : %s\n", str2);
getch();
}
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110. Program to add two matrix.

#include<stdio.h>
#include<conio.h>

void main()
{
int m, n, c, d, first[10][10], second[10][10], sum[10][10];
clrscr();

printf("Enter the number of rows and columns of matrix :");
scanf("%d%d", &m, &n);
printf("\nEnter the elements of first matrix : \n");

for (c = 0; c < m; c++)
{
for (d = 0; d < n; d++)
{
scanf("%d", &first[c][d]);
}
}

printf("\nEnter the elements of second matrix : \n");

for (c = 0; c < m; c++)
{
for (d = 0; d < n; d++)
{
scanf("%d", &second[c][d]);
}
}

printf("\nSum of entered matrices : \n");

for (c = 0; c < m; c++)
{
for (d = 0; d < n; d++)
{
sum[c][d] = first[c][d] + second[c][d];
printf("%d\t", sum[c][d]);
}
printf("\n");
}
getch();
}
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