/* TRIG.C illustrates trigonometric functions including: * cos cosh acos * sin sinh asin * tan tanh atan atan2 */ #include #include #include #include main() { double x, rx, y; do { printf( "\nEnter a real number between 1 and -1: " ); scanf( "%lf", &x ); } while( (x > 1.0) || (x < -1.0) ); printf("\nFunction\tResult for %2.2f\n\n", x ); if( (x <= 1.0) && (x >= -1.0) ) { printf( "acos\t\t%2.2f\n", acos( x ) ); printf( "asin\t\t%2.2f\n", asin( x ) ); } if( (rx = cos( x )) && (errno != ERANGE) ) printf( "cos\t\t%2.2f\n", rx ); else errno = 0; if( (rx = sin( x )) && (errno != ERANGE) ) printf( "sin\t\t%2.2f\n", rx ); else errno = 0; if( (rx = cosh( x )) && (errno != ERANGE) ) printf( "cosh\t\t%2.2f\n", rx ); else errno = 0; if( (rx = sinh( x )) && (errno != ERANGE) ) printf( "sinh\t\t%2.2f\n", rx ); else errno = 0; printf( "\nEnter a real number of any size: " ); scanf( "%lf", &x ); printf("\nFunction\tResult for %2.2f\n\n", x ); printf( "atan\t\t%2.2f\n", atan( x ) ); if( (rx = tan( x )) && (errno != ERANGE) ) printf( "tan\t\t%2.2f\n", rx ); else errno = 0; printf( "tanh\t\t%2.2f\n", tanh( x ) ); printf( "\nEnter another real number of any size: " ); scanf( "%lf", &y ); printf("\nFunction\tResult for %2.2f and %2.2f\n\n", x, y ); if( rx = atan2( x, y ) ) printf( "atan2\t\t%2.2f\n", rx ); else errno = 0; }