For a better understanding, we always recommend you to learn the basic topics of C programming listed below:
In this c program, we need to count the number of times a word appears in a given string. Here we need to find a number of times the word "the" comes in a string. For that, check whether each word is starting with the letter 't' if so, then check the next two letters after 't' is 'h' and 'e' and space is coming; if all the conditions are satisfied, increment the counter by one. Finally, we print the output as the counter number. In this program, 'while loop
' is used for execution.
while (testExpression)
{
// codes inside the body of a while
}
Here 'while loop
' evaluates test expression. Suppose the test expression is true, code inside 'while loop
' is executed. This process continues until the test expression is false if the test expression is a false 'while loop' is terminated.
STEP 1: Include the Header files to use the built-in functions in the C program.
STEP 2: Declare the integer variable 'count, times, t, h, e, space, and set count=0, times=0.
STEP 3: Declare the character Array 'str'.
STEP 4: Read a String from the user using the function gets().
STEP 5: By using a while loop
with the condition str[count]!='\0' ,increment count by 1.
STEP 6: Assign i=0.
STEP 7: Using another for loop
with the condition 'i<=count-3' do step 8.
STEP 8: Check the str[i]=t or str[i]=T ,if true the variable 't' becomes 1.
STEP 9: Check the str[i+1]=h or str[i+1]=H ,if true the variable h becomes 1.
STEP 10: Check the str[i+2]=e or str[i+2]=E ,if true the variable E becomes 1.
STEP 11: Check the str[i+3]=' ' or str[i+3]='\0' ,if true the variable space becomes 1.
STEP 12: Check if 't' and 'h' and 'e' and space are 1, then increment the variable times by 1.
STEP 13: increment 'i' by 1 and repeat step 7.
STEP 14: Then, Display the frequency of the word 'the' in the sentence as times.
#include<stdio.h>
#include<string.h>
void main() {
int count = 0, i, times = 0, t, h, e, space;
char str[100];
puts("Enter a string:");
gets(str);
while (str[count] != '\0') {
count++;
} /*Finding number of times word 'the'*is coming in the sentence*/
for (i = 0; i <= count - 3; i++) {
t = (str[i] == 't' || str[i] == 'T');
h = (str[i + 1] == 'h' || str[i + 1] == 'H'); /* Checks the word "the" is present in the sentence that user enters */
e = (str[i + 2] == 'e' || str[i + 2] == 'E');
space = (str[i + 3] == ' ' || str[i + 3] == '\0');
if ((t && h && e && space) == 1)
times++;
}
printf("Frequency of the word \'the\' is %d\n", times); /* displays output of the program */
}
Enter a string: The Teacher's day is the birth day of Dr.S.Radhakrishnan Frequency of the word 'the' is 2