| Author | Ian - Tutorial Posts = 62 |
| This tutorial will read in two numbers from the console line and output the answer of the two integer values. The cin refers to the console input, the >> allows the console input value placed into the variable (in this case the val1, val2), NOTE. << would mean output. With using the exception, and the try catch block of code allows for any errors in the conversion of the input into a integer value. Within the printf, there are a few conversion types, the %d means using the corresponding parameter within printf and output a integer value, %s means a string. When I say the corresponding parameter, if there are two %d within the output string, it will display in order the values attached to the printf(...) call. The code --- #include <iostream> #include <exception> //using the namespace std (standard) for the cin -> console input using namespace std; int main() { // setup the defaul values. int val1 =0, val2 =0; try { // output to the console printf("Please enter number 1 : "); // read in the input, if not a integer value, this will // cause a error cin >> val1; printf("Please enter number 2 : "); cin >> val2; } catch (exception& e) { // write out any error exception printf("Not a valid input %s\n", e.what()); } // output the answer of the two inputted values. printf("Answer : %d\n", (val1 + val2)); return 0; } --- save this as cppaddtwonumbers.cpp. Once compiled (g++ cppaddtwonumbers.cpp -o cppaddtwonumbers (the -o means to output to the filename else a a.out file name would be created)) Once executed the program, cppaddtwonumbers within Windows, or ./cppaddtwonumbers within Linux/Unix. The output would be Please enter number 1 : 23 Please enter number 2 : 41 Answer : 64 |
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