Commit 606bcf8

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Lines changed: 34 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -3,9 +3,42 @@`
`3`	`3`	`//Program to input a number and then calculate sum of its digits.`
`4`	`4`
`5`	`5`	`#include <iostream>`
	`6`	`+#include<string>`
	`7`	`+#include<cctype>`
	`8`	`+`
`6`	`9`	`using namespace std;`
`7`		`-int main() {`
	`10`	`+`
	`11`	`+void DigitsSum() {`
	`12`	`+`
	`13`	`+ cout << "Please enter a number that I can sum of their digit" << endl;`
	`14`	`+ string CusInput;`
	`15`	`+ int Sum = 0;`
	`16`	`+ bool Isvaild = 1;`
	`17`	`+`
	`18`	`+ while (1) {`
	`19`	`+ cin >> CusInput;`
	`20`	`+ for (char c : CusInput) {`
	`21`	`+ if (isdigit(c)) {`
	`22`	`+ int num = static_cast<int>(c - '0');`
	`23`	`+ Sum = Sum + num;`
	`24`	`+ }`
	`25`	`+ else {`
	`26`	`+ cout << "The input is invalid, please enter again" << endl;`
	`27`	`+ Isvaild = 0;`
	`28`	`+ break;`
	`29`	`+ }`
	`30`	`+ Isvaild = 1;`
	`31`	`+ }`
	`32`	`+ if (Isvaild) {`
	`33`	`+ cout << "The sum of the digits is " << Sum << endl;`
	`34`	`+ break;`
	`35`	`+ }`
	`36`	`+ }`
`8`	`37`
	`38`	`+}`
`9`	`39`
	`40`	`+int main() {`
	`41`	`+`
	`42`	`+ DigitsSum();`
`10`	`43`	`return 0;`
`11`	`44`	`}`

Lines changed: 16 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -17,6 +17,22 @@`
`17`	`17`	`3. Program to input a number and then calculate sum of its digits.`
`18`	`18`	`- Hint: let number = 562. Then you should print 5 + 6 + 2 = 13.`
`19`	`19`
	`20`	`+ #include<cctype> isdigit()`
	`21`	`+`
	`22`	`+ The functions determine whether the character is an integer.`
	`23`	`+`
	`24`	`+ Using mod to get a last number of a integer`
	`25`	`+`
	`26`	`+ sum = sum + a % 10;`
	`27`	`+`
	`28`	`+ a = a / 10;`
	`29`	`+`
	`30`	`+ static_cast`
	`31`	`+`
	`32`	`+ int num = static_cast<int>(c - '0');`
	`33`	`+`
	`34`	`+ The function will cast character c to a ASCII value like 5 is "53".`
	`35`	`+`
`20`	`36`	`4. Program to find whether given number is a prime number or not.`
`21`	`37`
`22`	`38`	`5. Program to display sum of series 1 + 1/2 + 1/3 + ... + 1/n.`

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