#include <stdio.h>#include <stdlib.h>#include <malloc.h>#include <string.h>int main(int argc,char *argv[]){	int strlen,pedlen,suffixlen,num,i,j;   	char *string;   	FILE *fp;   	strlen=atoi(argv[1]);   	pedlen=atoi(argv[2]);   	srand(atoi(argv[3]));   	string=(char*)malloc(strlen*sizeof(char));   	if(string==NULL){      	printf("malloc error\n");      	exit(1);   	}   	for(i=0;i<pedlen;i++){        num=rand()%26;        string[i]='a'+num;  	}   	for(j=1;j<(int)(strlen/pedlen);j++)       	strncpy(string+j*pedlen,string,pedlen);   	if((suffixlen=strlen%pedlen)!=0)   		strncpy(string+j*pedlen,string,suffixlen);  	if((fp=fopen(argv[4],"w"))!=NULL){     	fprintf(fp,"%s",string);      	fclose(fp);   	}   	else{     	printf("file open error\n");     	exit(1);   	}	return;}