1.4.4 if语句

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书中页数：P15
代码名称：occurs.cc

    #include <iostream>
    
    int main()
    {
    	// currVal is the number we're counting; we'll read new values into val
    	int currVal = 0, val = 0;
    
    	// read first number and ensure that we have data to process
    	if (std::cin >> currVal) {        
    		int cnt = 1;  // store the count for the current value we're processing
    		while (std::cin >> val) { // read the remaining numbers 
    			if (val == currVal)   // if the values are the same
    				++cnt;            // add 1 to cnt 
    			else { // otherwise, print the count for the previous value
    				std::cout << currVal << " occurs " 
    				          << cnt << " times" << std::endl;
    				currVal = val;    // remember the new value
    				cnt = 1;          // reset the counter
    			}
    		}  // while loop ends here
    		// remember to print the count for the last value in the file
    		std::cout << currVal << " occurs " 
    		          << cnt << " times" << std::endl;
    	} // outermost if statement ends here
    	return 0;
    }