C语言课程设计报告模板(8)

printf("input two numbers:"); scanf("%lf%lf",&a,&b); printf("%lf-%lf=%lf\n",a,b,a-b); }

void mul()//乘法运算 {

double a,b;

printf("input two numbers:"); scanf("%lf%lf",&a,&b); printf("%lf*%lf=%lf\n",a,b,a*b); }

void div()//除法运算 {

double a,b;

printf("input two numbers:"); scanf("%lf%lf",&a,&b); if(b==0)//被除数不能为0 printf("error\n"); else

printf("%lf/%lf=%lf\n",a,b,a/b); }

void add_n_to_m()//累加 {

int m,n,i=0,s=0; printf("input n and m:"); scanf("%d%d",&n,&m);

if(n>m) printf("error.\n");//条件限制 else {