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STANDARD C++ STRINGS
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[CHAP. 9
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print(oss); oss << s; print(oss); oss << " " << n; print(oss); oss << " " << x; print(oss); } void print(ostringstream& oss) { cout << "oss.str() = \"" << oss.str() << "\"" << endl; } oss.str() = "" oss.str() = "ABCDEFG" oss.str() = "ABCDEFG 33" oss.str() = "ABCDEFG 33 2.718" The output string stream object oss acts like the output stream object cout: the values of the string s, the integer n, and the number x are written to it by means of the insertion operator <<. While the internal object oss is like an external text file, its contents can be accessed as a string object by the call iss.str().
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EXAMPLE 9.9 Using an Input String Stream
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This program is similar to the one in Example 9.8 s except that it reads from an input string stream iss instead of writing to an output string stream.: void print(string&,int,float,istringstream&); int main() { string s; int n=0; float x=0.0; istringstream iss("ABCDEFG 44 3.14"); print(s,n,x,iss); iss >> s; print(s,n,x,iss); iss >> n; print(s,n,x,iss); iss >> x; print(s,n,x,iss); }
ABCDEFG 44 3.14
istringstream
ABCDEFG
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x 3.14
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void print(string& s, int n, float x, istringstream& iss) { cout << "s = \"" << s << "\", n = " << n << ", x = " << x << ", iss.str() = \"" << iss.str() << "\"" << endl; } s = "", n = 0, x = 0, iss.str() = "ABCDEFG 44 3.14" s = "ABCDEFG", n = 0, x = 0, iss.str() = "ABCDEFG 44 3.14" s = "ABCDEFG", n = 44, x = 0, iss.str() = "ABCDEFG 44 3.14" s = "ABCDEFG", n = 44, x = 3.14, iss.str() = "ABCDEFG 44 3.14" The input string stream object iss acts like the input stream object cin: values for the string s, the integer n, and the number x are read from it by means of the extraction operator >>. But the iss object also acts like an external file: reading from it does not change its contents.
TeamLRN
CHAP. 9]
STANDARD C++ STRINGS
Review Questions
9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 What is the difference between a C-string and a C++ string What is the difference between formatted input and unformatted input Why can t whitespace be read with the extraction operator What is a stream How does C++ simplify the processing of strings, external files, and internal files What is the difference between sequential access and direct access What do the seekg() and seekp() functions do What do the read() and write() functions do
Problems
9.1 Describe what the following code does:
char cs1[] = "ABCDEFGHIJ"; char cs2[] = "ABCDEFGH"; cout << cs2 << endl; cout << strlen(cs2) << endl; cs2[4] = 'X'; if (strcmp(cs1, cs2) < 0) cout << cs1 << " < " << cs2 << endl; else cout << cs1 << " >= " << cs2 << endl; char buffer[80]; strcpy(buffer, cs1); strcat(buffer, cs2); char* cs3 = strchr(buffer, 'G'); cout << cs3 << endl;
Describe what the following code does:
string s = "ABCDEFGHIJKLMNOP"; cout << s << endl; cout << s.length() << endl; s[8] = '!'; s.replace(8, 5, "xyz"); s.erase(6, 4); cout << s.find("!"); cout << s.find(" "); cout << s.substr(6, 3); s += "abcde"; string part(s, 4, 8); string stars(8, '*');
Describe what happens when the code
string s; int n; float x; cin >> s >> n >> x >> s;
executes on each of the following inputs: a. ABC 456 7.89 XYZ b. ABC 4567 .89 XYZ c. ABC 456 7.8 9XYZ d. ABC456 7.8 9 XYZ e. ABC456 7 .89 XYZ f. ABC4 56 7.89XY Z g. AB C456 7.89 XYZ h. AB C 456 7.89XYZ
STANDARD C++ STRINGS
[CHAP. 9
Trace the execution of the merge program in Example 9.7 on page 218 on the following two data files:
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