Derivation of univariate polynomial in C language

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Algorithm design ideas

1. The input character , If input enter is detected , Then stop the cycle , Execution procedure
2. Derivation of two consecutive characters
3. If the constant term is 0, The output “0 0”

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Code

#include <stdio.h>

int main(){
    
	int a=0, b=0, flag=0;
	char ch;
	do{
    
		scanf("%d %d", &a, &b);
		ch = getchar();
		if(b == 0){
    
			if(flag == 0){
    
				printf("0 0");
			}
		}else{
    
			if(flag == 0){
    
				printf("%d %d", a*b, b-1);
				flag = 1;
			}else{
    
				printf(" %d %d", a*b, b-1);
			}
		}
	}while(ch != '\n');
	return 0;
}

Running results