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;
}
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