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 C interview questions  C Interview Questions (2266)
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Question
C program to find frequency of each character in a text 
file?
 Question Submitted By :: C
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
#include <stdio.h>
int count[26];
int main()
{
FILE *f;
int i;
char ch;
f = fopen("capti.c","r");
while(!feof(f))
{
ch = fgetc(f);
count[ch - 'a']++;
}
for(i = 0;i < 26;i++)
printf("count[%c] = %d\n",65+i,count[i]);
fclose(f);
return 0;
}
//asuming only lower characters are required
 
Is This Answer Correct ?    21 Yes 6 No
Vadivel
 
Answer
# 2
#include <stdio.h>

int main()
{
FILE *file;
int alpha[26]={0};
const char fileName[]="abc.txt";
char ch;
file= fopen(fileName,"r");
if(file == NULL)
{
printf("cannot open the %s",fileName);
exit(8);
}
do
{
ch=fgetc(file);
char c = tolower(ch);
switch(c)
{
case'a': alpha[0]++;
break;
case'b': alpha[1]++;
break;
case'c': alpha[2]++;
break;
case'd': alpha[3]++;
break;
case'e': alpha[4]++;
break;
case'f': alpha[5]++;
break;
case'g': alpha[6]++;
break;
case'h': alpha[7]++;
break;
case'i': alpha[8]++;
break;
case'j': alpha[9]++;
break;
case'k': alpha[10]++;
break;
case'l': alpha[11]++;
break;
case'm': alpha[12]++;
break;
case'n': alpha[13]++;
break;
case'o': alpha[14]++;
break;
case'p': alpha[15]++;
break;
case'q': alpha[16]++;
break;
case'r': alpha[17]++;
break;
case's': alpha[18]++;
break;
case't': alpha[19]++;
break;
case'u': alpha[20]++;
break;
case'v': alpha[21]++;
break;
case'w': alpha[22]++;
break;
case'x': alpha[23]++;
break;
case'y': alpha[24]++;
break;
case'z': alpha[25]++;
break;
}

}while(ch != EOF);
int i;
for(i=0;i<26;i++)
{
printf("%d\n",alpha[i]);
}
return 0;
}

this is the correct answer
 
Is This Answer Correct ?    17 Yes 14 No
Yogesh Bansal
 
 
 
Answer
# 3
#include<stdio.h>
#include<string.h>
#include<iostream>
using namespace std;

int main()
{
char a[100],s[100];
gets(a);
int i,c[27],j;

for(int i=0;i <=26;i++)
c[i]=0;

for(i=0;i<strlen(a);i++)
{
if(a[i]>='a' && a[i]<='z')
{
c[ a[i] - 'a' ]++;
}
}

for(j=0;j <=26;j++)
{
if(c[j]>0)
{
printf("%c occurs %d times\n ",'a'+j,c[j]);
}
}

}
 
Is This Answer Correct ?    2 Yes 1 No
Silky
 
Answer
# 4
#include <iostream>
#include<fstream>
using namespace std;
int main()
{
int arr[26]={0},i;
ifstream fin;
ofstream fout;
fout.open("input.txt",ios::app);
fin.open("input.txt",ios::out);
char c;
fin>>c;
while(!fin.eof())
{
if(isalpha(c))
{
tolower(c);
switch(c)
{
case 'a':
arr[0]++;
break;
case 'b':
arr[1]++;break;
case 'c':
arr[2]++;break;
case 'd':
arr[3]++;break;
case 'e':
arr[4]++;break;
case 'f':
arr[5]++;break;
case 'g':
arr[6]++;break;
case 'h':
arr[7]++;break;
case 'i':
arr[8]++;break;
case 'j':
arr[9]++;break;
case 'k':
arr[10]++;break;
case 'l':
arr[11]++;break;
case 'm':
arr[12]++;break;
case 'n':
arr[13]++;break;
case 'o':
arr[14]++;break;
case 'p':
arr[15]++;break;
case 'q':
arr[16]++;break;
case 'r':
arr[17]++;break;
case 's':
arr[18]++;break;
case 't':
arr[19]++;break;
case 'u':
arr[20]++;break;
case 'v':
arr[21]++;break;
case 'w':
arr[22]++;break;
case 'x':
arr[23]++;break;
case 'y':
arr[24]++;break;
case 'z':
arr[25]++;break;
}
}
fin>>c;
}//endl of while.*/
for(i=0;i<26;i++)
fout<<"no of letter "<<static_cast<char>(i+65)<<" is
"<<arr[i]<<endl;
fin.close();
return 0;
}
 
Is This Answer Correct ?    3 Yes 24 No
Mahfooz Alam
 

 
 
 
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