8980. Number of sentences

Determine the number of sentences in the given text. Assume that a sentence ends with one of the following symbols: ‘.’ (period), ‘!’ (exclamation mark), or ‘?’ (question mark). It is assumed that the text does not contain combinations of symbols such as “...”, “!!!”, or “?!”.

Input. A single string containing text composed of Latin letters, punctuation marks, and spaces. The string length does not exceed 200 characters.

Output. Print the number of sentences in the text.

Sample input	Sample output
Hello, world!	1

SOLUTION

string

Algorithm analysis

To solve the problem, you need to count the number of characters ‘.’, ‘!’ and ‘?’ in the given string.

Algorithm implementation

Read the input string.

getline(cin, s);

The variable res is used to count the occurrences of the characters ‘.’, ‘!’ and ‘?’ in the string s.

res = 0;

for (i = 0; i < s.size(); i++)

if (s[i] == '.' || s[i] == '!' || s[i] == '?') res++;

Print the answer.

printf("%d\n", res);

Python implementation

Read the input string.

s = input()

The variable res is used to count the occurrences of the characters ‘.’, ‘!’ and ‘?’ in the string s.

res = 0

for x in s:

if x in ".!?": res += 1

Print the answer.

print(res)

Python implementation – sum for

Read the input string.

s = input()

The variable res is used to count the occurrences of the characters ‘.’, ‘!’ and ‘?’ in the string s.

res = sum(s.count(char) for char in '.!?')

Print the answer.

print(res)