c语言编程入门例题.doc

回文数（逆序数）main() long x,y=0,t; scanf(“%ld”,&x); t=x; while(x!=0) y=y*10+x%10; x=x/10; if(t=y) printf(“yes”); else printf(“no”);#include #include main() float s=0,t=1; int f=1,k=1; while(fabs(t)=1e-6) /*1 通项加到s上*/ s+=t; /*2调整通项*/ f=-f; k=k+2; t=1.0*f/k; printf(“s=%f”,4*s);P77 eg5.2main() float sum=0,t=1; int f=1,k=0; while(fabs(t)1e-4) sum=sum+t;f=-f; k=k+1; t=1.0*f/k/(k+1); printf(“sum=%f”,sum);穷举法main() int x,g,s,b,n=0; x=100; while(x=999) g=x%10; s=x/10%10; b=x/100;if(g*g*g+s*s*s+b*b*b=x) printf(“%5d”,x); n+; if(n%5=0) printf(“n”); x+; 素数main() int x,i,flag=1; scanf(“%d”,&x); for(i=2;i=x/2;i+)if(x%i=0) flag=0; if(flag) printf(“yes”); /*if(flag=1)*/ else printf(“no”);a,b所有素数main() int a,b,flag=1,x,n=0; scanf(“%d%d”,&a,&b); if(a2|bb) x=a;a=b;b=x; for(x=a;x=b;+x) flag=1; for(i=2;i=x/2;i+) if(x%i=0) flag=0;if(flag) printf(“%d “,x);n+; if(n%6=0) printf(“n”);九九乘法表main() int i,j; for(i=1;i=9;i+) /*行*/ for(j=1;j=9;j+) /*列*/ printf(“%d*%d=%2d “,i,j,i*j); printf(“n”);