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How to use the PI constant in C++
I want to use the PI constant and trigonometric functions in some C++ program. I get the trigonometric functions with include <math.h> . However, there doesn't seem to be a definition for PI in this header file.
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How to set tbody height with overflow scroll
...widths.
/* Set a fixed scrollable wrapper */
.tableWrap {
height: 200px;
border: 2px solid black;
overflow: auto;
}
/* Set header to stick to the top of the container. */
thead tr th {
position: sticky;
top: 0;
}
/* If we use border,
we must use table-collapse to avoid
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How to crop an image in OpenCV using Python
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this code crop an image from x=0,y=0 position to h=100,w=200
import numpy as np
import cv2
image = cv2.imread('download.jpg')
y=0
x=0
h=100
w=200
crop = image[y:y+h, x:x+w]
cv2.imshow('Image', crop)
cv2.waitKey(0)
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'printf' vs. 'cout' in C++
What is the difference between printf() and cout in C++?
16 Answers
16
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Is D a credible alternative to Java and C++? [closed]
Is the D language a credible alternative to Java and C++? What will it take to become a credible alternative? Should I bother learning it? Does it deserve evangelizing?
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How do you easily horizontally center a using CSS? [duplicate]
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In most browsers this will work:
div.centre {
width: 200px;
display: block;
background-color: #eee;
margin-left: auto;
margin-right: auto;
}
<div class="centre">Some Text</div>
In IE6 you will need to add another outer div:
div.layout {
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Command line progress bar in Java
...00, 1000);
[**********] 100%
Test with for loop
for (int i = 0; i <= 200; i = i + 20) {
progressPercentage(i, 200);
try {
Thread.sleep(500);
} catch (Exception e) {
}
}
The method can be easily modified:
public static void progressPercentage(int remain, int total) {
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Size of character ('a') in C/C++
What is the size of character in C and C++ ? As far as I know the size of char is 1 byte in both C and C++.
4 Answers
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What's the difference between __PRETTY_FUNCTION__, __FUNCTION__, __func__?
... and it has no special meaning during preprocessing.
__func__ was added to C++ in C++11, where it is specified as containing "an implementation-defined string" (C++11 §8.4.1[dcl.fct.def.general]/8), which is not quite as useful as the specification in C. (The original proposal to add __func__ to C...
Efficient string concatenation in C++
...se really necessary? If so, what is the best way to concatenate strings in C++?
13 Answers
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