Question

1 (continued) b. (20 points) Complete the function with the prototype and description below. void removeNonLetters (char estr); This function should remove all characters in string str except letters. Remember that, since the string is passed by address, changes made to str inside the function are seen outside the function. For example, if the string 1. ERCE.2160 Fall 2019" before calling this function, then after calling removeNonLetters (1). 51 - "EECEFall". Hint: to access part of a string (a substring) starting after the first character, use the address of the desired starting character. For example, given the original al above, &01 (5) can be used to access the substring *2160 Fall 2019". Using substrings with built-in string functions can simplify your solution. void removeNonLetters (char *str) { int i = 0; // Loop index // Loop to ensure all characters are covered // If current character is letter, move to next character if 77 Otherwise, remove the character by shifting all 71 characters that follow to the left by one position else {

Answer 1

void removeNonLetters(char *str) {

int i = 0;

while (str[i] != '\0') {

if ((str[i] >= 'A' && str[i] <= 'Z') || (str[i] >= 'a' && str[i] <= 'z') {

i ++;

} else {

for (int j=i; j<strlen(str)-1; j++) {

str[j] = str[j+1];

}

str[strlen(str)-1] = '\0';

}

}

}