Magic Square/영동

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~cpp 
//마방진  
#include<iostream.h>  
int main()  
{  
        int a;  
        int b;  
        int i=0;  
        int j=0;  
        int input;  
        int num=1;  
        do{  
                cout<<"한자리의 홀수를 입력하시오.\n";  
                cin>>input;  
        }while(input%2==0 || input>10 || input==0);  
        int mbj[11][11]={{0,},};  
          
        a = 1;  
        b = input/2+1;  
        for(i=0;i<11;i++){  
                mbj[0][i]=85;  
                mbj[10][i]=86;  
                mbj[i][0]=87;  
                mbj[i][10]=88;  
        }  
        mbj[0][0]=89;  
        mbj[a][b]=num;  
        while(num<input*input)  
        {  
                a--;  
                b--;  
                num++;  
                if(mbj[a][b]==85){
		if(mbj[input][b]!=0){
		         a=a+2; 
		         b=b+1; }
		else{
			a=input; 
		}
		mbj[a][b]=num;
				} 
                else if(mbj[a][b]==89){ 
		if(mbj[input][input]!=0){
			a=a+2;
			b=b+1;
		}
		else{
			a=input; 
		         b=input;}
			mbj[a][b]=num;
		}
                else if(mbj[a][b]==87){
		if(mbj[a][input]!=0){
			a=a+2;
			b=b+1;
		}
	         else
		         b=input; 
		         mbj[a][b]=num;}  
                else if(mbj[a][b]==0)
                    mbj[a][b]=num; 
                else{ 
                    a=a+2; 
                    b=b+1; 
                    mbj[a][b]=num;} 
        }  
        for(i=1;i<input+1;i++){  
                for(j=1;j<input+1;j++)  
                        cout<<mbj[i][j]<<"\t";  
                cout<<"\n";  
        }  
        return 0;  
}