Write a C program named as listLetterFreq.c that lists the frequency of the letters from the input via ignoring the case sensitivity. For example, sample outputs could be like below şcat test.txt This is a list of courses csc 1010 – COMPUTERS &APPLICATIONS ş . / listLetterFreq
#include<stdio.h>
#include<string.h>
int main()
{
char str[50];
printf(“Enter the name of file : “);
scanf(“%s”, str);
// open file in read mode
FILE *ptr = fopen(str, “r”);
printf(“nContents of %s …nn”, str);
// store the number of times character has appeared in the string
// index 0 is fo a
// index 1 is fo b
// index 2 is fo c
// .
// .
// .
// index 25 is for z
int arr[26];
int i;
// set the count of each character to 0
for( i = 0 ; i < 26 ; i++ )
arr[i] = 0;
// read a character in a file
char ch = fgetc(ptr);
// loop untill file ends
while( ch != EOF )
{
// read a character in a file
ch = fgetc(ptr);
// get the ascii code of current character
// tolower() converts the character passed as argument in lower case
int ascii = (int)tolower(ch);
if( ascii >= 97 && ascii <= 122 )
{
// get the index of character in arr
int index = ascii – 97;
// increase the frequency of current character
arr[index]++;
}
}
// close the file
fclose(ptr);
for( i = 0 ; i < 26 ; i++ )
printf(“Letter %c or %c appears %d timesn”, (char)( i + 97 ), (char)( i + 65 ) , arr[i]);
return 0;
}
————————test.txt———————–
This is a list of courses.
CSC 1010 – COMPUTERS & APPLICATIONS
Sample Output
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