大一上期末C语言编程题.doc

用公式 /4 = 1-1/3+1/5-1/7，编程序求的近似值，直到最后一项的绝对值小于10-4为止。#include#includemain()float pi=0,n=1,i=1,g=1; /在后面计算中需对g的值进行运算，为什么还要初始化while(fabs(g)=1e-4)pi+=g; /计算顺序的影响 n=n+2; i=-i;g=i/(float)n; pi*=4;printf(pi=%10.8fn,pi); /用%10.8f 输出活用一般形式输出有无影响 法2：#include#includevoid main() int s; float n,t,pi; s=1,pi=0,n=t=1.0; do pi+=t; n+=2; s=-s; t=s/n; while(fabs(t)1e-4); pi*=4; printf(pi=%.4fn,pi);用泰勒级数求e的近似值，直到最后一项小于1e-6为止。# includevoid main()int n=1;float a=1;double e=0;long b=1;for(;a=1e-6;n+)e+=a;b*=n;a=(float)1/b;printf(e=%lfn,e);求n的阶乘：#includeint a(int n)int b=1;if(n=1)b=n*a(n-1);return b;void main()int n,b;scanf(%d,&n);b=a(n);printf(%dn,b);冒泡排序：#include#define N 10main()int i,j,t;int aN=0,12,8,7,6,5,4,3,2,1;for(i=0;ii;j-)if(aj-1aj)t=aj-1;aj-1=aj;aj=t;printf(排序结果为:n);for(i=0;i=N-1;i+)printf(%d,ai);指针：计算字符段长度#include#define N 50int slength(char a)int count=0;while(*a!=0)count+;a+;return count;void main()char aN;int x;printf(输入一串字符：n);gets(a);x=slength(a);printf(字符串长度为%dn,x);查找字符串：#include#define N 3#define M 10int fun(char aM,char b)int find,i,j;for(i=0;iN;i+)find=1;for(j=0;jM;j+)if(aij!=bj)find=0;break;if(find=1) break;return find;void main()char aNM,bM;int x,i;printf(请输入3串字符n);for(i=0;iN;i+)gets(ai);fflush(stdin);printf(请输入查找的字符串：n);gets(b);x=fun(a,b);if(x) printf(所查找的存在n);else printf(所查找的不存在n);字符串排序：#include#include#include#define N 6void sort(char *a,int n)char *t;int i,j;for(i=0;ii;j-)if(strcmp(aj,aj-1)0)t=aj-1;aj-1=aj;aj=t;void main()char *aN;int i;for(i=0;i=N-1;i+)ai=(char*)malloc(10);printf(请输入%d个字符串：n,N);for(i=0;i=N-1;i+)gets(ai