C语言程序设计源代码.doc

C语言程序设计 哈哈哈 第二章 L2-1a-1 main() { int a; float b; char c; a = 1; b = 2.5; c = A; } L2-1a-2 main() { int a = 1; /* 定义整型变量a并对其初始化 */ float b = 2.5; /* 定义实型变量b并对其初始化 */ char c = A; /* 定义字符型变量c并对其初始化 */ } L2-1b #include stdio.h main() { int a = 1; float b = 2.5; char c = A; printf(a = %d\n, a); /* 按整型格式输出变量a的值 */ printf(b = %f\n, b); /* 按实型格式输出变量b的值 */ printf(c = %c\n, c); /* 按字符型格式输出变量c的值 */ printf(End of program\n); /* 输出一行字符串 */ } L2-2 #include stdio.h main() { printf(Data type Number of bytes\n); printf(------------ ---------------------\n); printf(char %d\n, sizeof(char)); printf(int %d\n, sizeof(int)); printf(short int %d\n, sizeof(short)); printf(long int %d\n, sizeof(long)); printf(float %d\n, sizeof(float)); printf(double %d\n, sizeof(double)); } L2-3 #include stdio.h main() { float a; double b; a = 123456.789e4; b = 123456.789e4; printf(%f\n%f\n,a,b); } 第三章 L3-1 #include stdio.h main() { int x, b0, b1, b2, sum; x = 153; b2 = x / 100; /*计算百位数字*/ b1 = (x - b2 * 100) / 10; /*计算十位数字*/ b0 = x % 10; /*计算个位数字*/ sum = b2 + b1 + b0; printf(b2=%d, b1=%d, b0=%d, sum=%d\n, b2, b1, b0, sum); } L3-2 #include stdio.h main() { double r = 5.3; /* 圆的半径 */ double circum; /* 圆的周长 */ double area; /* 圆的面积 */ circum = 2 * 3.14159 * r; /* 计算圆的周长 */ area = 3.14159 * r * r; /* 计算圆的面积 */ printf(circumference = %f\n, circum); printf(area = %f\n, area); } L3-3 #include stdio.h main() { double r; double circum; double area; printf(Input r:); /* 提示用户输入半径的值*/ scanf(%lf, r); /* 从键盘输入半径的值 */ circum = 2 * 3.14159 * r; area = 3