#include <stdio.h>
int main()
{
long sum = 23L;
float x = 2.181828;
printf("sizeof(x) = %d\n",sizeof(x));
printf("sizeof(float) = %d\n",sizeof(float));
printf("sizeof(3.1) = %d\n",sizeof(3.1));
printf("sizeof(3.14159) = %d\n",sizeof(3.14159));
printf("sizeof(3.14159f) = %d\n",sizeof(3.14159f));
printf("sizeof(3.1L) = %d\n",sizeof(3.1L));
printf("sizeof(3.14159l) = %d\n",sizeof(3.14159l));
printf("x = %f\n",x);
printf("sum = %ld, sum = %ld\n",sum, 23l);
return 0;
}#include <stdio.h>
#include <math.h>
int main(){
int a,b,x=5,y=3;
double z;
char c='1';
printf("'1'+'1'=%d\n",'1'+'1');
printf("'1'+49=%d\n",'1'+49);
printf("'A' = %d,\t 'a' = %d, \t'A'+32 = %c \n", 'A', 'a', 'A'+32);
printf("5/3=%d,\t 5.0/3 = %f,\t 5/3.0 = %f\n",5/3,5.0/3,5/3.0);
printf("(double)5/3 = %f,\t (double)(5/3)=%f\n",(double)5/3,(double)(5/3));
printf("(double)x/y = %f, \t z = x/y = %f\n",(double)x/y, z = x/y);
printf("1.0*x/y = %f, \t 1.0*(x/y) = %f\n",1.0*x/y,1.0*(x/y));
printf("What you entered are %d, %d\n",a,b);
scanf("%d,%d",&a,&b);
printf("sqrt(1.0*a*b)=%f\n",sqrt(1.0*a*b));
return 0;
}#include <stdio.h>
#define MIN(a,b) a<b?a:b
int main(){
int i,x,y;
printf("Please input two integers x and y \n");
scanf("%d %d",&x,&y);
for(i=x<y?x:y; i>0; i--){
if(x%i==0 && y%i==0){
printf("the greatest common divisor of %d and %d is %d\n",x,y,i);
break;
}
}
for(i=MIN(x,y); i>0; i--){
if(x%i==0 && y%i==0){
printf("the greatest common divisor of %d and %d is %d\n",x,y,i);
break;
}
}
return 0;
}#include <stdio.h>
#define MAX(a,b) a>b?a:b
int main(){
int i,x,y,max;
printf("Please input two integers x and y \n");
scanf("%d %d",&x,&y);
max = x*y+1;
for(i=x>y?x:y; i<max; i++){
if(i%x==0 && i%y==0){
printf("The lowest common multiple of %d and %d is %d\n",x,y,i);
break;
}
}
for(i=MAX(x,y); i<max; i++){
if(i%x==0 && i%y==0){
printf("The lowest common multiple of %d and %d is %d\n",x,y,i);
break;
}
}
return 0;
}#include <stdio.h>
#define MAX(a,b) a>b?a:b
#define MIN(a,b) a<b?a:b
int main(){
// the lowest common multiple of x and y
int i=2,x,y,z1,z0,z,max;
printf("Please input two integers x and y \n");
scanf("%d %d",&x,&y);
z1 = MAX(x,y);
z0 = MIN(x,y);
max = x*y+1;
z = z1;
while(z<max)
{
if(!(z%z0)) break;
z =z1*i++;
}
printf("The lowest common multiple of %d and %d is %d\n",x,y,z);
return 0;
}#include <stdio.h>
#include <math.h>
int main(){
// sin(x) = x/1-x^3/3!+x^5/5!-x^7/7!+...
int count = 0, sign = 1;
double x;
double denominator,numerator,sum;
printf("please input x = ");
scanf("%lf",&x);
numerator = x;
denominator = 1.0;
sum = numerator;
while(numerator/denominator>=1e-6){
count += 2;
sign *= -1;
numerator *= x*x;
denominator *= count*(count+1);
sum += sign*numerator/denominator;
}
printf("sin(x) ~= %f\n",sum);
printf("sin(x) = %f\n",sin(x)); //require math.h
return 0;
}