1. 176.
    0
    void main()
    {
    int a=0,e=0,i=0,o=0,u=0,sum=0;
    char c;
    clrscr();
    printf("Enter string:- ");
    printf("
    String will be terminated if you press Ctrl-Z & then ENTER.");
    printf("
    STRING:- ");
    while ((c=getchar())!=EOF)
    {
    if (c

    'a'||c

    'A')
    a=a+1;
    if (c

    'e'||c

    'E')
    e=e+1;
    if (c

    'i'||c

    'I')
    i=i+1;
    if (c

    'o'||c

    'O')
    o=o+1;
    if (c

    'u'||c

    'U')
    u=u+1;
    }
    sum=a+e+i+o+u;
    printf("
    Frequency of vowel 'a' is %d.",a);
    printf("
    Frequency of vowel 'e' is %d.",e);
    printf("
    Frequency of vowel 'i' is %d.",i);
    printf("
    Frequency of vowel 'o' is %d.",o);
    printf("
    Frequency of vowel 'u' is %d.",u);
    printf("
    Total no. of vowels in the text is %d.",sum);
    printf("

    HAVE A NICE DAY! BYE.");
    getch();
    }
    ···
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