Example 1: [Example 2 is much faster, don't say I didn't warn you!]
a = 9
b = 8
def concat[a, b]:
return eval[f"{a}{b}"]
Example:
>>> concat[a, b]
98
Example 2:
For people who think eval is 'evil', here's another way to do it:
a = 6
b = 7
def concat[a, b]:
return int[f"{a}{b}"]
Example:
>>> concat[a, b]
67
EDIT:
I thought it would be convienient to time these codes, look below:
>>> min[timeit.repeat["for x in range[100]: int[str[a] + str[b]]", "",
number=100000, globals = {'a': 10, 'b': 20}]]
9.107237317533617
>>> min[timeit.repeat["for x in range[100]: int[f'{a}{b}']", "",
number=100000, globals = {'a': 10, 'b': 20}]]
6.4986298607643675
>>> min[timeit.repeat["for x in range[5]: eval[f'{a}{b}']", "", #notice the range[5] instead of the range[100]
number=100000, globals = {'a': 10, 'b': 20}]]
4.089137231865948 #x20
The times:
eval: about 1 minute and 21 seconds.
original answer: about 9 seconds.
my answer: about 6 and a half seconds.
Conclusion:
The original answer does look more readable, but if you need a good speed, choose int[f'{vara}{varb}']
P.S: My int[f'{a}{b}] syntax only works on python 3.6+, as the f'' syntax is undefined at python versions 3.6-
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Given two integers a and b. The task is to concatenate these two integers into one integer.
Examples:
Input : a = 806, b = 91 Output : 80691 Input : a = 5, b = 1091 Output : 51091
Method 1: One method of achieving this can be counting the number of digits of second number. Then multiply the first number with 10^digits and adding both the numbers. Below is the implementation.
def numConcat[num1, num2]:
digits = len[str[num2]]
num1 = num1 * [10**digits]
num1 += num2
return num1
a =
906
b = 91
print[numConcat[a, b]]
Method 2: Another method can be converting both the numbers to the string. Then concatenate them and convert them back to integers. Below is the implementation.
def numConcat[num1, num2]:
num1 = str[num1]
num2 = str[num2]
num1 += num2
return int[num1]
a =
906
b = 91
print[numConcat[a, b]]
Output:
90691
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Given two integers n1 and n2, the task is to concatenate these two integers into one integer.
Example:
Input: n1 = 12, n2 = 34 Output: 1234 Input: n1 = 1, n2 = 93 Output: 193
Approach: The simplest approach to do this is:
- Convert both numbers to string
- Concatenate both strings into one, as this is comparatively easy
- Convert this concatenated string back to integer
Program:
C++
#include
#include
using namespace std;
int concat[int a, int b]
{
string s1 = to_string[a];
string s2 = to_string[b];
string s = s1 + s2;
int c = stoi[s];
return c;
}
int main[]
{
int a = 23;
int b = 43;
cout