/*======================================================================== Problem A+B(Big Integer) Time Limit:1000MS Memory Limit:65536KB Total Submit:3205 Accepted:922 Description Give two positive integer A and B,calucate A+B. Notice that A,B is no more than 500 digits. Input The test case contain several lines.Each line contains two positive integer A and B. Output For each input line,output a line contain A+B Sample Input 2 3 1231231231823192 123123123123123 1000000000000000 1 Sample Output 5 1354354354946315 1000000000000001 Source EOJ ==========================================================================*/
http://202.120.80.191/problem.php?problemid=1001
1 #include<stdio.h> 2 #include<string.h> 3 void sum(char a[],char b[],char c[]);//c=a+b 4 void swap(char a[]); 5 int main() 6 { 7 char a[503],b[503],c[505]; 8 freopen("5.in","r",stdin); 9 while(scanf("%s%s",a,b)!=EOF)//while(cin>>a>>b) 10 { 11 sum(a,b,c); 12 printf("%s ",c); 13 } 14 return 0; 15 } 16 void sum(char a[],char b[],char c[])//c=a+b 17 { 18 int i,lenA,lenB,min,max; 19 int carry=0,t; 20 lenA=strlen(a); 21 lenB=strlen(b); 22 swap(a); 23 swap(b); 24 if(lenA>lenB) 25 { 26 max=lenA; 27 min=lenB; 28 } 29 else 30 { 31 max=lenB; 32 min=lenA; 33 } 34 for(i=0;i<min;i++) 35 { 36 t=(a[i]-'0')+(b[i]-'0')+carry; 37 c[i]=t%10+'0'; 38 carry=t/10; 39 } 40 if(lenA>lenB) 41 { 42 for(i=min;i<max;i++) 43 { 44 t=(a[i]-'0')+carry; 45 c[i]=t%10+'0'; 46 carry=t/10; 47 } 48 } 49 else 50 { 51 for(i=min;i<max;i++) 52 { 53 t=(b[i]-'0')+carry; 54 c[i]=t%10+'0'; 55 carry=t/10; 56 } 57 } 58 if(carry!=0) 59 { 60 c[i]=carry+'0'; 61 i++; 62 } 63 c[i]=' '; 64 swap(c); 65 } 66 void swap(char a[]) 67 { 68 int i,len=strlen(a),t=len/2; 69 char ch; 70 for(i=0;i<t;i++) 71 { 72 ch=a[i]; 73 a[i]=a[len-1-i]; 74 a[len-1-i]=ch; 75 } 76 }