Category：C
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C example of marking in serial 19 printf
1、 Tags in printf() 1. introduction to marking sign meaning – The item to be printed is aligned to the left, that is, the item is printed from the left side of the field. Example: “-20s” + If the signed value is positive, a plus sign will be displayed in front of the value; If […]
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A graphic elimination algorithm for c++ continuous view decision
In the Lianliankan game we have played, we can determine whether two elements with the same graphics can be connected within three turns by selecting them. If they can, they will be deleted. If not, they will not be deleted until they are completely eliminated. This algorithm does not include the determination of deadlock state. […]
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6. C language 99 multiplication table (five output forms)
The 99 multiplication table consists of 9 rows and 9 columns, focusing onFor loopKnowledge of.The following is the code for outputting the complete multiplication table, upper right, lower right, upper left and lower left multiplication tables.[code 1] output complete triangle: 1 #include 2 int main() { 3 int i,j; // i. J control row or […]
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Implementation of converting opencv video into image sequence
Opencv based video to image sequence method: Based on c++ version #include <iostream> #include “cv.h” #include “opencv2/opencv.hpp” using namespace std; using namespace cv; void main() { VideoCapture cap(“C:\\Users\\Leo\\Desktop\\Megamind.avi”); if ( !cap.isOpened() ) { return ; } int imgIndex(0); for ( ; ; ) { Mat frame; cap >> frame; if ( frame.empty() ) { break; […]
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7. C language Yanghui triangle (two methods)
We have known Yanghui triangle since junior high school. Now, let’s use C language to display it on the computer. In junior high school, we knew that the numbers of the two waists of Yanghui triangle were 1, and the numbers of other positions were the sum of the two numbers on the top. This […]
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Example of reducing the time for OpenCV to read high-resolution images
significance At present, the resolution of cameras in both industry and life will be higher and higher. Whether opencv is used for image processing in academia or industry, especially in mass processing, if the time to read a high-resolution image into memory is reduced, it will greatly help the efficiency of mass image processing. Especially […]
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8. C language to calculate pi (three methods)
Topic 1) use formula ① to calculate the approximate value of π. It is required to accumulate until the last item is less than 10^ (-6). Topic 2) according to formula ②, use the product of the first 100 items to calculate the value of π. Topic 1) provides one solution, and topic 2) provides […]
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Solve the problem that the CodeBlocks breakpoint is invalid continuously
Reason 1 – this is what I saw, effective be careful:Set (cmake_build_type debug) should be placed after the project Otherwise, the breakpoint debugging is invalid. Here is an example: PROJECT (HELLO) cmake_minimum_required(VERSION 2.8) set (CMAKE_BUILD_TYPE Debug) include_directories ( include ./ mavlink/include/mavlink/v1.0) SET(SRC_LIST autopilot_interface.cpp src/BaseMavlinkControl.cpp mavlink_control.cpp serial_port.cpp) set (thread_lib -pthread) MESSAGE(STATUS “This is BINARY dir ” […]
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9. C language judging primes (seeking primes) (two methods)
Prime numbers are also called prime numbers. A prime number is a number that cannot be divided by any integer except 1 and itself. For example, 17 is a prime number because it cannot be divided by any integer from 2 to 16.Train of thought 1): therefore, to judge whether an integer m is a […]
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CodeBlocks undefined reference method for ‘cv:: waitkey (int)’
Undefined reference to ‘cv:: waitkey (int)’ I always thought it was the c++11 or g++ version. I saw: http://forum.ubuntu.com.cn/viewtopic.php?f=48&t=377522 Propose: g++ `pkg-config –cflags –libs opencv` lena.cpp -o lena This will cause compilation to fail, and g++ lena.cpp `pkg-config –cflags –libs opencv` -o lena This will succeed. I tried, and it was true. The undefined reference […]
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10. C language output diamond (detailed version)
Diamond is the figure shown below. The total number of rows is equal to the total number of columns: Write a program to print out diamonds according to the total number of rows entered by the user.This topic is mainly to find out the rules and examine the logical thinking of readers.You can start from […]
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Ubuntu operation method for modifying GCC version
Method 1: First, let’s take a look at the GCC commands installed in your Ubuntu: LS /usr/bin/gcc* -l my display is lrwxrwxrwx 1 root root 7 2011-08-14 15:17 /usr/bin/gcc -> gcc-4.6 -rwxr-xr-x 1 root root 224544 2011-10-06 05:47 /usr/bin/gcc-4.4 -rwxr-xr-x 1 root root 237072 2011-09-17 17:25 /usr/bin/gcc-4.5 -rwxr-xr-x 1 root root 302104 2011-09-17 05:43 /usr/bin/gcc-4.6 […]