Remove Characters in String Except Alphabets
#include <stdio.h>
int main() {
char line[150];
printf("Enter a string: ");
fgets(line, sizeof(line), stdin); // take input
for (int i = 0, j; line[i] != '\0'; ++i) {
// enter the loop if the character is not an alphabet
// and not the null character
while (!(line[i] >= 'a' && line[i] <= 'z') && !(line[i] >= 'A' && line[i] <= 'Z') && !(line[i] == '\0')) {
for (j = i; line[j] != '\0'; ++j) {
// if jth element of line is not an alphabet,
// assign the value of (j+1)th element to the jth element
line[j] = line[j + 1];
}
line[j] = '\0';
}
}
printf("Output String: ");
puts(line);
return 0;
}
Output
Enter a string: p2'r-o@gram84iz./ Output String: programiz
This program takes a string input from the user and stores in the line variable. Then, a for
loop is used to iterate over characters of the string.
If the character in a string is not an alphabet, it is removed from the string and the position of the remaining characters are shifted to the left by 1 position.