COS, COSF, COSL

double cos(double x); cosine 계산
float cosf(float x); cosine 계산
long double cosl(long double x); cosine 계산
 
입력 매개 변수 리스트
x radian
반환 값
cosine 값
 
사용 예
//C언어 표준 라이브러리 함수 사용법 가이드
//double cos(double x); cosine 계산
//float cosf(float x); cosine 계산
//long double cosl(long double x); cosine 계산
//0, 30, 45, 60, 90도의 cosine 값
 
#include <math.h>
#include <stdio.h>
 
int main(void)
{
    double radian;
    radian = 0.0;
    printf("%f 도\n", radian * 180 / 3.141592);
    printf("cos(%f)  = %.30f\n", radian, cos(radian));
    printf("cosf(%f) = %.30f\n", radian, cosf((float)radian));
    printf("cosl(%f) = %.30f\n", radian, cosl(radian));
 
    radian = 30 * 3.141592 / 180;
    printf("%f 도\n", radian * 180 / 3.141592);
    printf("cos(%f)  = %.30f\n", radian, cos(radian));
    printf("cosf(%f) = %.30f\n", radian, cosf((float)radian));
    printf("cosl(%f) = %.30f\n", radian, cosl(radian));
 
    radian = 45 * 3.141592 / 180;
    printf("%f 도\n", radian * 180 / 3.141592);
    printf("cos(%f)  = %.30f\n", radian, cos(radian));
    printf("cosf(%f) = %.30f\n", radian, cosf((float)radian));
    printf("cosl(%f) = %.30f\n", radian, cosl(radian));
 
    radian = 60 * 3.141592 / 180;
    printf("%f 도\n", radian * 180 / 3.141592);
    printf("cos(%f)  = %.30f\n", radian, cos(radian));
    printf("cosf(%f) = %.30f\n", radian, cosf((float)radian));
    printf("cosl(%f) = %.30f\n", radian, cosl(radian));
 
    radian = 90 * 3.141592 / 180;
    printf("%f 도\n", radian * 180 / 3.141592);
    printf("cos(%f)  = %.30f\n", radian, cos(radian));
    printf("cosf(%f) = %.30f\n", radian, cosf((float)radian));
    printf("cosl(%f) = %.30f\n", radian, cosl(radian));
 
    return 0;
}
}
 
출력
0.000000 도
cos(0.000000)  = 1.000000000000000000000000000000
cosf(0.000000) = 1.000000000000000000000000000000
cosl(0.000000) = 1.000000000000000000000000000000
30.000000 도
cos(0.523599)  = 0.866025458250249569047696240887
cosf(0.523599) = 0.866025447845458984375000000000
cosl(0.523599) = 0.866025458250249569047696240887
45.000000 도
cos(0.785398)  = 0.707106896725981814988415408152
cosf(0.785398) = 0.707106888294219970703125000000
cosl(0.785398) = 0.707106896725981814988415408152
60.000000 도
cos(1.047197)  = 0.500000188675109646929684004135
cosf(1.047197) = 0.500000178813934326171875000000
cosl(1.047197) = 0.500000188675109646929684004135
90.000000 도
cos(1.570796)  = 0.000000326794896538138350772186
cosf(1.570796) = 0.000000313916473260178463533521
cosl(1.570796) = 0.000000326794896538138350772186