用C语言编写一个程序，完成以下功能

请帮忙尽快解答几个C的问题,十分

/*------------1----------------------*/ #include int main() { int i; char str[500]={''}; FILE *fp; scanf("%s",str); if((fp = fopen("res。 txt","w+")) == NULL) { printf("Can't open file 'result。txt'!\n"); system("pause"); exit(0); } fprintf(fp,"original:\t%s",str); for(i=0;i='A')&&(str[i] int main(...全部

  /*------------1----------------------*/ #include int main() { int i; char str[500]={''}; FILE *fp; scanf("%s",str); if((fp = fopen("res。
  txt","w+")) == NULL) { printf("Can't open file 'result。txt'!\n"); system("pause"); exit(0); } fprintf(fp,"original:\t%s",str); for(i=0;i='A')&&(str[i] int main() { int i=0,m=0; char ch='',tmp=''; FILE *fp; scanf("%c",&ch); if((fp = fopen("data。
  txt","r")) == NULL) { printf("Can't open file 'result。
  txt'!\n"); system("pause"); exit(0); } /*fseek(fp,0,SEEK_SET);设置文件开头*/ while((tmp=fgetc(fp))!=EOF) { if(ch==tmp) { i++; } /*printf("%c",tmp);*/ m++; } fclose(fp); printf("\nseek:%c\ntotal:%d\nrestult:%d\n",ch,m,i); system("pause"); return 0; } /*------------3----------------------*/ #include int main() { int x=0; scanf("%d",&x); printf("%o\n",x); system("pause"); return 0; } /*------------4----------------------*/ #include int main() { int a[100]={1,1,3,3,4,4,4,4,5,6,7,7,7,9,22,33},b[100]={0}; int i=0,j=1,al=0,bl=0; for(i=0;a[i]!='\0';i++) { al++; } printf("al=%d\n",al); system("pause"); b[0]=a[0]; for(i=1;i收起