An array of characters is called a string.
Declaration
Following is the declaration for declaring an array is as follows −
char stringname [size];
For example − char string[50]; string of length 50 characters
Initialization
- Using single character constant −
char string[10] = { ‘H’, ‘e’, ‘l’, ‘l’, ‘o’ ,‘\0’}
- Using string constants −
char string[10] = "Hello":;
Accessing − There is a control string "%s" used for accessing the string till it encounters ‘\0’.
Finding minimum occurrence
The logic to find minimum occurrence of a character in a given string is as follows −
for(i=0; i<CHARS; i++){ if(frequency[i]!=0){ if(frequency[minimum] == 0 || frequency[i]< fequency[minimum]) minimum = i; }
Program
Following is the C program to find minimum occurring character in a string.
#include<stdio.h> #define SIZE 100 // Maximum string size #define CHARS 255 // Maximum characters allowed int main(){ char string[SIZE]; int frequency[CHARS]; int i = 0, minimum; int value; printf("Enter the string:\n "); gets(string); for(i=0; i<CHARS; i++){ frequency[i] = 0; // initialize freq of all char to zero } i=0; while(string[i] != '\0'){ // finding freq of each char value = (int)string[i]; frequency[value] += 1; i++; } minimum = 0; for(i=0; i<CHARS; i++){// finding min freq if(frequency[i]!=0){ if(frequency[minimum] == 0 || frequency[i]<fequency[minimum]) minimum = i; } printf("Minimum occurrence character is '%c' = %d times.", minimum, frequency[minimum]); return 0; }
Output
When the above program is executed, it produces the following result −
Enter the string: tutorialspoint Minimum occurrence character is 'a' = 1 times.