为什么80分？！

P1957 口算练习题

lce11451410086 @ 2024-12-05 21:06:00


#include<bits/stdc++.h>
using namespace std;
char c[25000];
int main(){
    int t;
    scanf("%d",&t);
    char last;
    for(int sssss=1;sssss<=t;sssss++){
        if(sssss==1){

            getchar();
        }
        cin.getline(c,15);
        int len=2;
        char fu;
        if(c[0]>='a'&&c[0]<='c'){
            if(c[0]=='a'){
                fu='+';
            }else if(c[0]=='b'){
                fu='-';
            }else{
                fu='*';
            }
            int num1=0,num2=0;
            int s=0;
            for(int i=2;c[i]!=' ';i++){
                num1=num1*10+(c[i]-'0');
                s=i;
            }
            for(int i=s+2;c[i]!='\0';i++){
                num2=num2*10+int(c[i]-'0');
            }
            int sum=0;
            if(fu=='+'){
                sum=num1+num2;
            }else if(fu=='-'){
                sum=num1-num2;
            }else if(fu=='*'){
                sum=num1*num2;
            }
            if(sum<0){
                len++;
            }
            int f=abs(sum);
            int a=num1,b=num2;
            for(int i=1;a!=0;i++,len++){
                a/=10;
            }
            for(int i=1;b!=0;i++,len++){
                b/=10;
            }
            for(int i=1;f!=0;i++,len++){
                f/=10;
            }
            printf("%d%c%d=%d\n%d\n",num1,fu,num2,sum,len);
        }else{
            int num1=0,num2=0,s=0;
            for(int i=0;c[i]!=' ';i++){
                num1=num1*10+(c[i]-'0');
                s=i;
            }
            for(int i=s+2;c[i]!='\0';i++){
                num2=num2*10+int(c[i]-'0');
            }
            int sum=0;
            if(last=='+'){
                sum=num1+num2;
            }else if(last=='-'){
                sum=num1-num2;
            }else if(last=='*'){
                sum=num1*num2;
            }
            if(sum<0){
                len++;
            }
            int f=abs(sum);
            int a=num1,b=num2;
            for(int i=1;a!=0;i++,len++){
                a/=10;
            }
            for(int i=1;b!=0;i++,len++){
                b/=10;
            }
            for(int i=1;f!=0;i++,len++){
                f/=10;
            }
            printf("%d%c%d=%d\n%d\n",num1,fu,num2,sum,len);
            last=' ';
        }
        last=fu;
    }
    return 0;
}

by pjh0625 @ 2024-12-05 21:19:09

@lce11451410086

#include<bits/stdc++.h>
using namespace std;
int n,x,y;
char ss[20],ans[100],k;
int main() {
    scanf("%d",&n);
    for(int i=1; i<=n; i++) {
        scanf("%s",&ss);
        if(isalpha(ss[0])) {
            k=ss[0];
            scanf("%d%d",&x,&y);
        } else {
            x=atoi(ss);
            scanf("%d",&y);
        }
        if(k=='a')
            sprintf(ans,"%d+%d=%d",x,y,x+y);
        else if(k=='b')
            sprintf(ans,"%d-%d=%d",x,y,x-y);
        else
            sprintf(ans,"%d*%d=%d",x,y,x*y);
        printf("%s\n%d\n",ans,strlen(ans));
    }
    return 0;
}

by pjh0625 @ 2024-12-05 21:20:35

@lce11451410086

#include<bits/stdc++.h>
using namespace std;
int n,x,y;
char ss[20],ans[100],k;
int main() {
    scanf("%d",&n);
    for(int i=1; i<=n; i++) {
        scanf("%s",&ss);
        if(isalpha(ss[0])) {
            k=ss[0];
            scanf("%d%d",&x,&y);
        } else {
            x=atoi(ss);
            scanf("%d",&y);
        }
        if(k=='a')
            sprintf(ans,"%d+%d=%d",x,y,x+y);
        else if(k=='b')
            sprintf(ans,"%d-%d=%d",x,y,x-y);
        else
            sprintf(ans,"%d*%d=%d",x,y,x*y);
        printf("%s\n%d\n",ans,strlen(ans));
    }
    return 0;
}

by sgjyzzb @ 2024-12-06 19:57:58

@lce11451410086如果2个运算数或者结果为0？

by lce11451410086 @ 2024-12-06 21:25:43

@pjh0625 那个isalpha是什么意思

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