Question

Create an algorithm for a program that reads a string with a maximum length of 30 from the keyboard. The algorithm should then copy the characters from that string into a second character array in order but only if the character is a vowel (a, e, i, o, u). Once copied, the algorithm should output these values in order. The algorithm should then count and display the number of times each vowel appears in the array. Finally, the algorithm should also output the index in the second array where each vowel first appeared or a suitable message if a particular vowel is not in the array at all.

(Programming exercise)

Implement the program from Question 1 into a C program. The program should take suitable steps to trap and recover from errors.

Answer 1

ALGORITHM:

input: string
if c:string is vowel
v <- c
for each c in v
count <- 0   
count = unique c:v
if count==1
first_time <- v:c
counts <- count
output: v,counts,first_time

C-PROGRAM:

#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;
}

Enter a string of characters(lower case): qaswedfrtghyujiklmnbvcxzasderb Vowels present: a eu i a e Vowels count: a: 2 e: 2 u: Index of first appearance: a: 0 i: 3 o: never appeare u.

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