第四讲： C语言程序设计初体验

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/*Exercise 1: last name dot matrix*/

int main(){    printf("         *    *          *  **********  *           *    \n");    printf("      *       *          *  *           * *         *    \n");    printf("    *         *          *  *           *  *        *    \n");    printf("  *           *          *  *           *   *       *    \n");    printf(" *            *          *  *           *    *      *    \n");    printf("*             ************  **********  *     *     *    \n");    printf("*             *          *  *           *      *    *    \n");    printf("*             *          *  *           *       *   *    \n");    printf(" *            *          *  *           *        *  *    \n");    printf("   *          *          *  *           *         * *    \n");    printf("      *       *          *  *           *          **    \n");    printf("          *   *          *  **********  *           *    \n");}

/* Exercise 2 (1): calculate area and perimeter*/int main(){    float a,b,area,pmeter;    printf("Please insert length a & b: ");    scanf("%f %f",&a,&b);    pmeter=(a+b)*2;    area=a*b;    printf("The perimeter is %f\n",pmeter);    printf("The area is %f\n",area);    return 0;}

/*Exercise 2 (2): calculate resistance */int main(){    float a,b,r;    printf("Please insert R1 & R2: ");    scanf("%f %f", &a,&b);    r=1/(1/a+1/b);    printf("The resistance R is: %f\n",r);    return 0;}

/*Exercise 2 (3): convert C to F */ int main() {     float c,f;     printf("Please insert temperature in Celsius: ");     scanf("%f",&c);     f=c*9/5+32;     printf("%f Celsius is %f Fahrenheit \n",c,f);     return 0; }/* Exercise 2(4): calculate area for cylinder*/

int main() {     float r,h,a;     printf("Please insert radius R and height H: ");     scanf("%f %f",&r,&h);     a=2*3.1415926*r*h+2*3.1415926*r*r;     printf("The surface area is: %f\n",a);     return 0; }

小结：特别喜欢这门课，有时间花上十几分钟看看视频然后做做练习~ 感谢贺老师的无私奉献！

问题：小数点后面怎么规定取几位呢？刚发现用printf(“%.2f") 就好了

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