July Huaqing learning-1

C Language Output input

for example

scanf（“%2d,%*3d,%2d”）
There are only two characters before and after , And the middle three are gone
a = " "
scanf（“%s”,a）
print(“%d”,a)
So that is 0 Corresponding 32
Spaces are valid characters in character types

Remove garbage characters

#include <stdio.h>

int main(int argc, char *argv[])
{
int a;
char x;
printf(“>”);
scanf(“%d”,&a);
//getchar();
scanf(" %c",&x);
pr intf(“%d :%c : %d\n”,a ,x,x);
return 0;

scanf Input cannot use spaces ,gets（） You can use spaces ;

puts() Can wrap lines automatically

man sqrt
NAME
sqrt, sqrtf, sqrtl - square root function

SYNOPSIS
#include <math.h>

   double sqrt(double x);
   float sqrtf(float x);
   long double sqrtl(long double x);

   Link with -lm.