C语言编程练习.pptVIP

* Chapter 9 User-Defined Functions 9.10 9.10 Develop a modular interactive program using functions that reads the values of three sides of a triangle and displays either its area or its perimeter as per the request of the user. Given the three sides a, b and c. * Chapter 9 User-Defined Functions 9.10 #include math.h float a, b, c; void sides ( ) { printf ( Please input the 3 sides of a triangle: ); scanf ( %f%f%f, a, b, c ); } void perimeter ( ) { printf ( The perimeter of this triangle is %.2f.\n, a + b + c ); } void area ( ) { float s; s = ( a + b + c ) / 2; printf ( The area of this triangle is %.2f.\n, sqrt((s-a)*(s-b)*(s-c)) ); } main( ) { char ch; sides ( ); printf ( Do you want to calculate the perimeter or area (p/a)? ); scanf ( %c, ch ); do { if ( ch == p || ch == P ) { perimeter ( ) ; break ; } else if ( ch == a || ch == A ) { area ( ); break; } else scanf ( %c, ch ); } while ( 1 ); } * Chapter 9 User-Defined Functions 9.11 9.11 Write a function that can be called to find the largest element of an m by n matrix. * Chapter 9 User-Defined Functions 9.11 #define M 3 #define N 2 int max_element ( int a[M][N] ) { int max, i , j; max = a[0][0]; for ( i = 0; i M; i ++ ) for ( j = 0; j N; j ++ ) if ( a[i][j] max ) max = a[i][j]; return ( max ); } main( ) { int a[M][N], i, j; printf ( Please input the %d by %d matrix: \n, M, N ); for ( i = 0; i M; i ++ ) for ( j = 0; j N; j ++ ) scanf ( %d, a[i][j] ); printf ( The largest element is: %d.\n, max_element ( a ) ); } * Chapter 9 User-Defined Functions 9.12 9.12 Write a function that can be called to compute the product of two matrices of size m by n and n by m. The main function provides the values for m and n and two matrices. * Chapter 9 User-Defined Functions 9.12 #define M 3 #define N 2 void product ( int a[M][N], int b[N][M] ) { int c[M][M], i , j, k; printf ( The product of matrix A and matrix B is : \n ); for ( i =