Question

Write a c program that reads a string with a maximum length of 30 from the keyboard[1]. The program should then copy the characters from that input string into a second character array (in order of input). However, only if a character is a vowel (a, e, i, o, u) should it be copied into the second array. Once copied, the program should output the values stored in the second array (in order of input). The program should then count and display the number of times each vowel appears in the second array. Also, the program should determine and output the index in the second array where each vowel first appeared or display a suitable message if a particular vowel is not in the array at all.

 

Your solution must be modular in design; you should consider in your design the issues of high cohesion and code re-use (refer to the lecture notes for module four, on modular design and programming).

 

 

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[1]     Remember strings differ from a regular character array by the inclusion of the null character (‘\0’) following the last alphabetical character. A regular character array just stored characters and does not include null.

Answer 1

#include<stdio.h>
int main(){
int C = 30; //maximum string length
char sentence[C];
char v[C];
char vowels[] = {'a','e','i','o','u'};
// INPUT THE STRING, STORED IN sentence[]
printf("\nEnter a string of characters(lower case): ");
for(int i=0;i<C;i++){
scanf("%c",&sentence[i]);
}
//CHECKING FOR VOWELS
int j = 0;
for(int i=0;i<C;i++){
if(sentence[i]=='a'||sentence[i]=='e'||sentence[i]=='i'||sentence[i]=='o'||sentence[i]=='u'){
v[j] = sentence[i];
j = j+1;
}
}
//DISPLAY THE VOWELS PRESENT IN THE INPUT STRING
int N = j; //number of vowels present in the string
printf("\nVowels present: ");
if(N>0){
for(int i=0;i<N;i++){
printf("%c ",v[i]);
}
}
// COMPUTE THE COUNT FOR EACH VOWEL AND THE INDEX WHERE THEY APPEARED FIRST
int n,vcount[] = {0,0,0,0,0}; // count 0 means vowel never appeared
int first_appeared[] = {-1,-1,-1,-1,-1}; // index -1 means vowel never appeared
if(N>0){
for(int i=0;i<5;i++){ // 5 for the number of vowels known
n = 0;
for(int k=0;k<N;k++){
if(v[k]==vowels[i]){
if(n==0){
first_appeared[i] = k;
}
n = n+1;
}
}
vcount[i] = n;
}
}
// DISPLAYING THE COUNT FOR EACH VOWEL
printf("\nVowels count: \n");
for(int i=0;i<5;i++){ //5 for the number of vowels known
if(vcount[i]>0)
printf("%c: %d\n",vowels[i],vcount[i]);
}
//DISPLAYING THE INDEX OF FIRST APPEARANCE
printf("\nIndex of first appearance: \n");
for(int i=0;i<5;i++){ //5 for the number of vowels known
if(first_appeared[i]>=0)
printf("%c: %d\n",vowels[i],first_appeared[i]);
else
printf("%c: never appeared\n",vowels[i]);
}
return 0;
}