What is the system() function?

system is a C/C function. The detailed explanation of the system function under the Windows operating system is mainly applied in C language. The system function needs to be added with the header file before it can be called.

system is a C/C function. The detailed explanation of the system () function under the Windows operating system is mainly applied in C language. The system function needs to be added with the header file before it can be called.

Function name: system

Function: Issue a DOS command

Usage: int system(char *command);

Program example:

#include <stdlib.h>
#include <stdio.h>
int main(void)
{
    printf("About to spawn and run a DOS command\n");
    system("dir");
    return 0;
}

Another example: system("pause") can freeze the screen to facilitate observing the execution results of the program; system("CLS") can clear the screen. Calling the color function can change the foreground color and background of the console. The specific parameters are explained below.

For example, use system("color 0A"); where the 0 after color is the background color code, and A is the foreground color code. The color codes are as follows:

0=black 1=blue 2=green 3=lake blue 4=red 5=purple 6=yellow 7=white 8=grey 9=light blue A=light green B=light green C=light red D=lavender E=light yellow F=bright white

(Note: Microsoft Visual C 6.0 supports system)

The color attribute consists of two sixteen Base digits specified - the first corresponds to the background, the second to the foreground. Each number

can be any of the following values:

0 = black 8 = gray

1 = blue 9 = light blue
　2 = green A = Light green
　3=Light greenB=Light light green
　4=RedC=Light red
　5=PurpleD=Light purple
　6=YellowE=Light yellow
　7=White F = bright white

Recommended tutorial: "c Language Tutorial"

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