学习devilc++的日常第二弹敲敲敲敲敲敲代码1.a++,++a，a--,--a。2.scanf①#include <stdio.h>int main(){ int a = 1; printf(" a= %d\n", ++a); printf(" a= %d\n", a); return 0;}②#include <stdio.h>int main(){ int a = 10,b = 20,c = 30,d = 40; int a1 = ++a,b1 = b++,c1 = --c,d1 = d--; printf(" a= %d,a1= %d\n", a,a1); printf(" b= %d,b1= %d\n", b,b1); printf(" c= %d,c1= %d\n", c,c1); printf(" d= %d,d1= %d\n", d,d1); return 0;}③#include <stdio.h>int main(){ printf("$$$$$$\n"); int age = 18; printf("我今年%d岁了\n",age); int a1 = 1; int a2 = 2; int a3 = 3; int a4 = 4; printf("%-9d,%-9d,%-9d,%-9d\n",a1,a2,a3,a4); return 0;}④#include <stdio.h>int main(){ double f = 888.923672; printf("f: %.10f %.20f %.30f\n",f,f,f); return 0;}⑤#include <stdio.h>int main(){ int a = 0,b = 0,c = 0,d = 0; printf("please input a number:"); scanf("%d,%d", &a, &b);//输入两个整数并分别赋值给a,b c = a + b; printf("c = %d\n",c); return 0;}